ubsan.c (ubsan_use_new_style_p): Fix check for empty string.

gcc/
	* ubsan.c (ubsan_use_new_style_p): Fix check for empty string.

From-SVN: r239971

gcc/ChangeLog

+2016-09-03  Kirill Yukhin  <kirill.yukhin@intel.com>
+
+	* ubsan.c (ubsan_use_new_style_p): Fix check for empty string.
+
 2016-09-02  David Malcolm  <dmalcolm@redhat.com>
 
 	* common.opt (fdiagnostics-generate-patch): New option.

gcc/ubsan.c

@@ -1469,7 +1469,7 @@ ubsan_use_new_style_p (location_t loc)
 
   expanded_location xloc = expand_location (loc);
   if (xloc.file == NULL || strncmp (xloc.file, "\1", 2) == 0
-      || xloc.file == '\0' || xloc.file[0] == '\xff'
+      || xloc.file[0] == '\0' || xloc.file[0] == '\xff'
       || xloc.file[1] == '\xff')
     return false;