poll.c: always set revents, even if to zerorb/compat-poll-fix

Match what is done to pfd[i].revents when compute_revents() returns
0 to the upstream gnulib's commit d42461c3 ("poll: fixes for large
fds", 2015-02-20).  The revents field is set to 0, without
incrementing the value rc to be returned from the function.  The
original code left the field to whatever random value the field was
initialized to.

This fixes occasional hangs in git-upload-pack on HPE NonStop.

Signed-off-by: Randall S. Becker <randall.becker@nexbridge.ca>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/compat/poll/poll.c b/compat/poll/poll.c
index b10adc780f..ae03b74a6f 100644
--- a/compat/poll/poll.c
+++ b/compat/poll/poll.c
@@ -438,6 +438,10 @@ poll (struct pollfd *pfd, nfds_t nfd, int timeout)
 	    pfd[i].revents = happened;
 	    rc++;
 	  }
+	else
+	  {
+	    pfd[i].revents = 0;
+	  }
       }
 
   return rc;