[2.6 patch] fs/smbfs/request.c: fix NULL dereference

[Adrian Bunk <bunk@stusta.de>]

The Coverity checker found that if req was NULL because find_request 
returned NULL, this resulted in a break from the switch, but req was 
later dereferenced (look at the last line of this patch).

Signed-off-by: Adrian Bunk <bunk@stusta.de>

--- linux-2.6.12-rc1-mm2-full/fs/smbfs/request.c.old	2005-03-25 00:45:08.000000000 +0100
+++ linux-2.6.12-rc1-mm2-full/fs/smbfs/request.c	2005-03-25 00:47:14.000000000 +0100
@@ -783,20 +783,23 @@ int smb_request_recv(struct smb_sb_info 
 			break;
 		break;
 
 		/* We should never be called with any of these states */
 	case SMB_RECV_END:
 	case SMB_RECV_REQUEST:
 		server->rstate = SMB_RECV_END;
 		break;
 	}
 
+	if (!req)
+		return -ENOMEM;
+
 	if (result < 0) {
 		/* We saw an error */
 		return result;
 	}
 
 	if (server->rstate != SMB_RECV_END)
 		return 0;
 
 	result = 0;
 	if (req->rq_trans2_command && req->rq_rcls == SUCCESS)