cifs: Fix TCP_Server_Info::credits to be signed

commit 5b2ff48 upstream.

Fix TCP_Server_Info::credits to be signed, just as echo_credits and
oplock_credits are.  This also fixes what ought to get at least a
compilation warning if not an outright error in *get_credits_field() as a
pointer to the unsigned server->credits field is passed back as a pointer
to a signed int.

Signed-off-by: David Howells <[email protected]>
cc: [email protected]
Cc: [email protected]
Acked-by: Paulo Alcantara (Red Hat) <[email protected]>
Acked-by: Pavel Shilovskiy <[email protected]>
Signed-off-by: Steve French <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: dhowells

fs/smb/client/cifsglob.h

@@ -740,7 +740,7 @@ struct TCP_Server_Info {
 	bool nosharesock;
 	bool tcp_nodelay;
 	bool terminate;
-	unsigned int credits;  /* send no more requests at once */
+	int credits;  /* send no more requests at once */
 	unsigned int max_credits; /* can override large 32000 default at mnt */
 	unsigned int in_flight;  /* number of requests on the wire to server */
 	unsigned int max_in_flight; /* max number of requests that were on wire */