Bluetooth: CSIS: Remove set handle check from verify_members_and_get_inst

The verify_members_and_get_inst can be used for more than just
locking the set, so checking the specific handle in that
does not make sense.

The handle is furthermore already checked in
csis_client_write_set_lock.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>

subsys/bluetooth/audio/csis_client.c

diff --git a/subsys/bluetooth/audio/csis_client.c b/subsys/bluetooth/audio/csis_client.c
index 3398d50..b8c60c5 100644
--- a/subsys/bluetooth/audio/csis_client.c
+++ b/subsys/bluetooth/audio/csis_client.c
@@ -1275,11 +1275,6 @@
 			return -EINVAL;
 		}
 
-		if (inst->cli.set_lock_handle == 0) {
-			BT_DBG("Member[%d] lock handle not set", i);
-			return -EINVAL;
-		}
-
 		if (*out_inst == NULL ||
 		    (lowest_rank && inst->cli.rank < (*out_inst)->cli.rank) ||
 		    (!lowest_rank && inst->cli.rank > (*out_inst)->cli.rank)) {