org-export: Change signatures of first-sibling-p and last-sibling-p

* contrib/lisp/org-export.el (org-export-first-sibling-p,
  org-export-last-sibling-p): Remove communication channel from
  signature.
* contrib/lisp/org-e-html.el (org-e-html-headline): Apply signature
  changes.
* contrib/lisp/org-e-latex.el (org-e-latex-headline): Apply signature
  changes.
* contrib/lisp/org-e-odt.el (org-e-odt-headline): Change code
  comments.

contrib/lisp/org-e-html.el

@@ -2116,10 +2116,10 @@ holding contextual information."
 	     (itemized-body (org-e-html-format-list-item
 			     contents type nil nil full-text)))
 	(concat
-	 (and (org-export-first-sibling-p headline info)
+	 (and (org-export-first-sibling-p headline)
 	      (org-e-html-begin-plain-list type))
 	 itemized-body
-	 (and (org-export-last-sibling-p headline info)
+	 (and (org-export-last-sibling-p headline)
 	      (org-e-html-end-plain-list type)))))
      ;; Case 3. Standard headline.  Export it as a section.
      (t

contrib/lisp/org-e-latex.el

@@ -46,7 +46,7 @@
 (declare-function org-export-data "org-export" (data info))
 (declare-function org-export-directory "org-export" (type plist))
 (declare-function org-export-expand-macro "org-export" (macro info))
-(declare-function org-export-first-sibling-p "org-export" (headline info))
+(declare-function org-export-first-sibling-p "org-export" (headline))
 (declare-function org-export-footnote-first-reference-p "org-export"
 		  (footnote-reference info))
 (declare-function org-export-format-code "org-export"
@@ -61,7 +61,7 @@
 (declare-function org-export-unravel-code "org-export" (element))
 (declare-function org-export-inline-image-p "org-export"
 		  (link &optional extensions))
-(declare-function org-export-last-sibling-p "org-export" (headline info))
+(declare-function org-export-last-sibling-p "org-export" (headline))
 (declare-function org-export-low-level-p "org-export" (headline info))
 (declare-function org-export-output-file-name
 		  "org-export" (extension &optional subtreep pub-dir))
@@ -1277,14 +1277,14 @@ holding contextual information."
       (let ((low-level-body
 	     (concat
 	      ;; If the headline is the first sibling, start a list.
-	      (when (org-export-first-sibling-p headline info)
+	      (when (org-export-first-sibling-p headline)
 		(format "\\begin{%s}\n" (if numberedp 'enumerate 'itemize)))
 	      ;; Itemize headline
 	      "\\item " full-text "\n" headline-label pre-blanks contents)))
 	;; If headline is not the last sibling simply return
 	;; LOW-LEVEL-BODY.  Otherwise, also close the list, before any
 	;; blank line.
-	(if (not (org-export-last-sibling-p headline info)) low-level-body
+	(if (not (org-export-last-sibling-p headline)) low-level-body
 	  (replace-regexp-in-string
 	   "[ \t\n]*\\'"
 	   (format "\n\\\\end{%s}" (if numberedp 'enumerate 'itemize))

contrib/lisp/org-e-odt.el

@@ -2893,10 +2893,10 @@ holding contextual information."
      ;; 	     (itemized-body (org-e-odt-format-list-item
      ;; 			     contents type nil nil full-text)))
      ;; 	(concat
-     ;; 	 (and (org-export-first-sibling-p headline info)
+     ;; 	 (and (org-export-first-sibling-p headline)
      ;; 	      (org-e-odt-begin-plain-list type))
      ;; 	 itemized-body
-     ;; 	 (and (org-export-last-sibling-p headline info)
+     ;; 	 (and (org-export-last-sibling-p headline)
      ;; 	      "</text:list>"))))
      ;; Case 3. Standard headline.  Export it as a section.
      (t

contrib/lisp/org-export.el

@@ -2882,15 +2882,13 @@ Any tag belonging to this list will also be removed."
 			      (member tag tags)))
 		 (org-element-property :tags element)))
 
-(defun org-export-first-sibling-p (headline info)
-  "Non-nil when HEADLINE is the first sibling in its sub-tree.
-INFO is the plist used as a communication channel."
+(defun org-export-first-sibling-p (headline)
+  "Non-nil when HEADLINE is the first sibling in its sub-tree."
   (not (eq (org-element-type (org-export-get-previous-element headline))
 	   'headline)))
 
-(defun org-export-last-sibling-p (headline info)
-  "Non-nil when HEADLINE is the last sibling in its sub-tree.
-INFO is the plist used as a communication channel."
+(defun org-export-last-sibling-p (headline)
+  "Non-nil when HEADLINE is the last sibling in its sub-tree."
   (not (org-export-get-next-element headline)))