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git: improve error on short read

we don't recover from an invalid packet, so just
sysfatal with a useful message.

--- a/sys/src/cmd/git/proto.c

+++ b/sys/src/cmd/git/proto.c

@@ -58,8 +58,8 @@

 	char *e;

 	int n;

-	if(readn(c->rfd, len, 4) == -1)

-		return -1;

+	if(readn(c->rfd, len, 4) != 4)

+		sysfatal("pktline: short read from transport");

 	len[4] = 0;

 	n = strtol(len, &e, 16);

 	if(n == 0){

-- 

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