internal: remove unused variable

The variable 'ret' is unused when compiling on big-endian architecture.

This produces an "unused variable" message, which might be treated as error
if -Werror was passed to compiler.

With this patch I was able to compile flashrom cleanly on ppc and ppc64:

http://koji.fedoraproject.org/koji/taskinfo?taskID=2472482
http://koji.fedoraproject.org/koji/taskinfo?taskID=2472484



Corresponding to flashrom svn r1180.
Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>

internal.c

@@ -118,7 +118,9 @@ int is_laptop = 0;
 
 int internal_init(void)
 {
+#if __FLASHROM_LITTLE_ENDIAN__
 	int ret = 0;
+#endif
 	int force_laptop = 0;
 	char *arg;