Prepare larger packet buffer for upload-pack protocol.

The original side-band support added to the upload-pack protocol used the
default 1000-byte packet length.  The pkt-line format allows up to 64k, so
prepare the receiver for the maximum size, and have the uploader and
downloader negotiate if larger packet length is allowed.

Signed-off-by: Junio C Hamano <junkio@cox.net>

fetch-clone.c

@@ -115,7 +115,7 @@ static pid_t setup_sideband(int sideband, const char *me, int fd[2], int xd[2])
 		die("%s: unable to fork off sideband demultiplexer", me);
 	if (!side_pid) {
 		/* subprocess */
-		char buf[DEFAULT_PACKET_MAX];
+		char buf[LARGE_PACKET_MAX];
 
 		close(fd[0]);
 		if (xd[0] != xd[1])