MDEV-24884 fixup: Remove a bogus assertion

rw_lock::upgrade_trylock(): If the compare-and-swap fails,
only assert that we are still holding the U lock and that
no conflicting lock exists. If the upgrade to X would fail due
to some thread holding an S latch, we will terminate the loop.

storage/innobase/include/rw_lock.h

@@ -99,7 +99,6 @@ class rw_lock
       /* Either conflicting (read) locks have been granted, or
       the WRITER_WAITING flag was set by some thread that is waiting
       to become WRITER. */
-      DBUG_ASSERT(!(~l & (UPDATER - 1)) || l == (UPDATER | WRITER_WAITING));
       DBUG_ASSERT(((WRITER | UPDATER) & l) == UPDATER);
       if (~(WRITER_WAITING | UPDATER) & l)
         return false;