Merge branch 'et/spell-poll-infinite-with-minus-one-only'

We used to pass -1000 to poll(2), expecting it to also mean "no
timeout", which should be spelled as -1.

* et/spell-poll-infinite-with-minus-one-only:
  upload-pack: keep poll(2)'s timeout to -1
diff --git a/upload-pack.c b/upload-pack.c
index c9ea1d3..c789ec0 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -166,7 +166,9 @@
 		if (!pollsize)
 			break;
 
-		ret = poll(pfd, pollsize, 1000 * keepalive);
+		ret = poll(pfd, pollsize,
+			keepalive < 0 ? -1 : 1000 * keepalive);
+
 		if (ret < 0) {
 			if (errno != EINTR) {
 				error("poll failed, resuming: %s",