lock_table_create(), lock_rec_create(): Clean up the WSREP code

By definition, c_lock->trx->lock.wait_lock==c_lock cannot hold.
That is, the owner transaction of a lock cannot be waiting for that
particular lock. It must have been waiting for some other lock.
Remove the dead code related to that. Also, test c_lock for NULLness
only once.

storage/innobase/lock/lock0lock.cc

@@ -1626,13 +1626,6 @@ lock_rec_create_low(
 				trx_mutex_enter(trx);
 			}
 
-			/* trx might not wait for c_lock, but some other lock
-			   does not matter if wait_lock was released above
-			 */
-			if (c_lock->trx->lock.wait_lock == c_lock) {
-				lock_reset_lock_and_trx_wait(lock);
-			}
-
 			trx_mutex_exit(c_lock->trx);
 
 			if (wsrep_debug) {