CIFS: Change mid_q_entry structure fields

to be protocol-unspecific and big enough to keep both CIFS
and SMB2 values.

Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index d2ccce8..425e4f2 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -268,7 +268,7 @@
 		list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
 			++num_mids;
 			if (mid_entry->mid == cur_mid &&
-			    mid_entry->midState == MID_REQUEST_SUBMITTED) {
+			    mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
 				/* This mid is in use, try a different one */
 				collision = true;
 				break;