cifs: attempt to freeze while looping on a receive attempt

In the recent overhaul of the demultiplex thread receive path, I
neglected to ensure that we attempt to freeze on each pass through the
receive loop.

Reported-and-Tested-by: Woody Suwalski <terraluna977@gmail.com>
Reported-and-Tested-by: Adam Williamson <awilliam@redhat.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index d6a972d..8cd4b52 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -441,6 +441,8 @@
 	smb_msg.msg_controllen = 0;
 
 	for (total_read = 0; to_read; total_read += length, to_read -= length) {
+		try_to_freeze();
+
 		if (server_unresponsive(server)) {
 			total_read = -EAGAIN;
 			break;