IB/srpt: Fix ACL lookup during login

Make sure that the initiator port GUID is stored in ch->ini_guid.
Note: when initiating a connection sgid and dgid members in struct
sa_path_rec represent the source and destination GIDs. When accepting
a connection however sgid represents the destination GID and dgid the
source GID.

Fixes: commit 2bce1a6 ("IB/srpt: Accept GUIDs as port names")
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/ulp/srpt/ib_srpt.c

@@ -2077,7 +2077,7 @@ static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
 		goto destroy_ib;
 	}
 
-	guid = (__be16 *)&param->primary_path->sgid.global.interface_id;
+	guid = (__be16 *)&param->primary_path->dgid.global.interface_id;
 	snprintf(ch->ini_guid, sizeof(ch->ini_guid), "%04x:%04x:%04x:%04x",
 		 be16_to_cpu(guid[0]), be16_to_cpu(guid[1]),
 		 be16_to_cpu(guid[2]), be16_to_cpu(guid[3]));