scsi: qla4xxx: Prevent a potential error pointer dereference

The qla4xxx_get_ep_fwdb() function is supposed to return NULL on error,
but qla4xxx_ep_connect() returns error pointers. Propagating the error
pointers will lead to an Oops in the caller, so change the error pointers
to NULL.

Fixes: 13483730a13b ("[SCSI] qla4xxx: fix flash/ddb support")
Signed-off-by: Dan Carpenter <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Chris Leech <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/qla4xxx/ql4_os.c

···
 
 	ep = qla4xxx_ep_connect(ha->host, (struct sockaddr *)dst_addr, 0);
 	vfree(dst_addr);
+	if (IS_ERR(ep))
+		return NULL;
 	return ep;
 }