t-strvec: use va_end() to match va_start()

Our check_strvec_loc() helper uses a variable argument list. When we
va_start(), we must be sure to va_end() before leaving the function.
This is required by the standard (though the effect of forgetting will
vary between platforms).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/unit-tests/t-strvec.c

@@ -22,11 +22,13 @@ static void check_strvec_loc(const char *loc, struct strvec *vec, ...)
 			strbuf_addf(&msg, "strvec index %"PRIuMAX, (uintmax_t) nr);
 			test_assert(loc, msg.buf, 0);
 			strbuf_release(&msg);
+			va_end(ap);
 			return;
 		}
 
 		nr++;
 	}
+	va_end(ap);
 
 	check_uint(vec->nr, ==, nr);
 	check_uint(vec->alloc, >=, nr);