Clear any struct padding in idbuf

libraries/liblmdb/mdb.c

@@ -5151,6 +5151,7 @@ mdb_env_setup_locks(MDB_env *env, MDB_name *fname, int mode, int *excl)
 #define	MDB_SHORT_SEMNAMES	1	/* limited to 14 chars */
 #endif
 		if (fstat(env->me_lfd, &stbuf)) goto fail_errno;
+		memset(&idbuf, 0, sizeof(idbuf));
 		idbuf.dev = stbuf.st_dev;
 		idbuf.ino = stbuf.st_ino;
 		env->me_txns->mti_mutexid = mdb_hash(&idbuf, sizeof(idbuf))