Update comment: Valgrind 1.9.4 seems to always respect client

requests, without needing --client-perms=yes.

source/lib/util_str.c

@@ -441,7 +441,7 @@ void clobber_region(const char *fn, unsigned int line, char *dest, size_t len)
 	 *
 	 * (This is not redundant with the clobbering above.  The
 	 * marking might not actually take effect if we're not running
-	 * under valgrind or not with --client-perms.) */
+	 * under valgrind.) */
 	VALGRIND_MAKE_WRITABLE(dest, len);
 #endif /* VALGRIND */
 #endif /* DEVELOPER */