scsi: libfc: remove unnecessary assertion on ep variable

In ft_recv_write_data(), the pointer ep is dereferenced first and then
asserts for NULL. The patch removes the unnecessary assertion.

Link: https://lore.kernel.org/r/20191217212214.30722-1-pakki001@umn.eduReviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/target/tcm_fc/tfc_io.c

@@ -221,7 +221,6 @@ void ft_recv_write_data(struct ft_cmd *cmd, struct fc_frame *fp)
 	ep = fc_seq_exch(seq);
 	lport = ep->lp;
 	if (cmd->was_ddp_setup) {
-		BUG_ON(!ep);
 		BUG_ON(!lport);
 		/*
 		 * Since DDP (Large Rx offload) was setup for this request,