Bugfix, there was one entry too much.

It failed when mixed (int double) table is used as input variable e.g
| 1 | 1.2 |

TINYCHANGE

lisp/ob-C.el

@@ -264,7 +264,7 @@ FORMAT can be either a format string or a function which is called with VAL."
 	   (when (and type (not (string= type-name tmp-type-name)))
 	     (if (and (member type-name '("int" "double" "int32_t"))
 		      (member tmp-type-name '("int" "double" "int32_t")))
-		 (setq tmp-type '("double" "" "%f"))
+		 (setq tmp-type '("double" "%f"))
 	       (error "Only homogeneous lists are supported by C.  You can not mix %s and %s"
 		      type-name
 		      tmp-type-name)))