Fix another dereference before null check warning

null tcon is not possible in these paths so
remove confusing null check

Reported by Coverity (CID 728519)

Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Jeff Layton <jlayton@samba.org>
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 78b329f..65cd7a8 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1632,7 +1632,7 @@
 
 	rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
 
-	if ((rc != 0) && tcon)
+	if (rc != 0)
 		cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
 
 	free_rsp_buf(resp_buftype, iov[0].iov_base);