Fix minor memory s in psql's tab completion.

Tang Haiying and Tom Lane Discussion: https://postgr.es/m/OS0PR01MB6113EA19F05E217C823B4CCAFB909@OS0PR01MB6113.jpnprd01.prod.outlook.com

Author: tglsfdc

src/bin/psql/tab-complete.c

@@ -5159,6 +5159,10 @@ _complete_from_query(const char *simple_query,
 
 /* Clean up */
 termPQExpBuffer(&query_buffer);
+if (schemaname)
+free(schemaname);
+if (objectname)
+free(objectname);
 free(e_object_like);
 if (e_schemaname)
 free(e_schemaname);

src/fe_utils/string_utils.c

@@ -1227,4 +1227,7 @@ patternToSQLRegex(int encoding, PQExpBuffer dbnamebuf, PQExpBuffer schemabuf,
 appendPQExpBufferStr(dbnamebuf, curbuf->data);
 termPQExpBuffer(curbuf);
 }
+
+if (want_literal_dbname)
+termPQExpBuffer(&left_literal);
 }