util: call va_end() after va_copy() (v2)

CID 157804 (#1 of 1): Missing varargs init or cleanup (VARARGS)
16. missing_va_end: va_end was not called for tmp.

v2: typo fix

Reported-by: Mr Coverity
Signed-off-by: Andrew Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

util.c

@@ -76,6 +76,7 @@ static char *xvstrcat(char *str, const char *fmt, va_list args)
 		if (new) {
 			va_copy(tmp, args);
 			ret = vsnprintf(new + offset, delta, fmt, tmp);
+			va_end(tmp);
 			if (ret >= delta) {
 				/* NOTE: vsnprintf returns the amount of bytes
 				 * to allocate. */