scsi: bnx2i: add error handling for ioremap_nocache

When ioremap_nocache fails, the lack of error-handling code may cause
unexpected results.

This patch adds error-handling code after calling ioremap_nocache.

Signed-off-by: Zhouyang Jia <[e-mail]>
Reviewed-by: Johannes Thumshirn <[e-mail]>
Acked-by: Manish Rangankar <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/bnx2i/bnx2i_hwi.c

···
 					      BNX2X_DOORBELL_PCI_BAR);
 		reg_off = (1 << BNX2X_DB_SHIFT) * (cid_num & 0x1FFFF);
 		ep->qp.ctx_base = ioremap_nocache(reg_base + reg_off, 4);
+		if (!ep->qp.ctx_base)
+			return -ENOMEM;
 		goto arm_cq;
 	}