MDEV-24410: Bug in SRW_LOCK_DUMMY rw_lock_t wrapper

In commit 43d3dad1 we forgot to
invert the return values of rw_tryrdlock() and rw_trywrlock(),
causing strange failures.

storage/innobase/include/srw_lock.h

@@ -124,10 +124,10 @@ class srw_lock_low
   void init() { my_rwlock_init(&lock, nullptr); }
   void destroy() { rwlock_destroy(&lock); }
   void rd_lock() { rw_rdlock(&lock); }
-  bool rd_lock_try() { return rw_tryrdlock(&lock); }
+  bool rd_lock_try() { return !rw_tryrdlock(&lock); }
   void rd_unlock() { rw_unlock(&lock); }
   void wr_lock() { rw_wrlock(&lock); }
-  bool wr_lock_try() { return rw_trywrlock(&lock); }
+  bool wr_lock_try() { return !rw_trywrlock(&lock); }
   void wr_unlock() { rw_unlock(&lock); }
 # endif
 };