[PATCH] Fix several gcc4 signedness warnings

Here is a patch that fixes several gcc4 warnings about different signedness,
all between char and unsigned char. I tried to keep the patch minimal
so resertod to casts in three places.

Signed-off-by: Mika Kukkonen <mikukkon@iki.fi>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

ssh-push.c

@@ -8,7 +8,7 @@ unsigned char remote_version = 0;
 int serve_object(int fd_in, int fd_out) {
 	ssize_t size;
 	int posn = 0;
-	char sha1[20];
+	unsigned char sha1[20];
 	unsigned long objsize;
 	void *buf;
 	signed char remote;