Fix objc_skip_offset() to avoid skipping and extra character

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/libobjc/trunk@30149 72102866-910b-0410-8b05-ffd578937521

encoding.c

@@ -698,8 +698,8 @@ objc_skip_offset (const char *type)
 {
   if (*type == '+')
     type++;
-  while (isdigit ((unsigned char) *++type))
+  while (isdigit ((unsigned char) *type))
-    ;
+    type++;
   return type;
 }