backport fix from revision 7856 of trunk

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@7899 65c4cc65-6c06-0410-ace0-fbb531ad65f3

db.c

@@ -121,8 +121,10 @@ int ast_db_deltree(const char *family, const char *keytree)
 	}
 	
 	ast_mutex_lock(&dblock);
-	if (dbinit()) 
+	if (dbinit()) {
+		ast_mutex_unlock(&dblock);
 		return -1;
+	}
 	
 	memset(&key, 0, sizeof(key));
 	memset(&data, 0, sizeof(data));