Remove some obsolete procedure-specific code from PLs

Since procedures are now declared to return void, code that handled
return values for procedures separately is no longer necessary.

src/pl/plperl/plperl.c

@@ -2832,8 +2832,7 @@ compile_plperl_function(Oid fn_oid, bool is_trigger, bool is_event_trigger)
 		 * Get the required information for input conversion of the
 		 * return value.
 		 ************************************************************/
-		if (!is_trigger && !is_event_trigger &&
-			procStruct->prokind != PROKIND_PROCEDURE)
+		if (!is_trigger && !is_event_trigger)
 		{
 			Oid			rettype = procStruct->prorettype;
 

src/pl/plpython/plpy_procedure.c

@@ -206,9 +206,9 @@ PLy_procedure_create(HeapTuple procTup, Oid fn_oid, bool is_trigger)
 
 		/*
 		 * get information required for output conversion of the return value,
-		 * but only if this isn't a trigger or procedure.
+		 * but only if this isn't a trigger.
 		 */
-		if (!is_trigger && procStruct->prokind != PROKIND_PROCEDURE)
+		if (!is_trigger)
 		{
 			Oid			rettype = procStruct->prorettype;
 			HeapTuple	rvTypeTup;

src/pl/tcl/pltcl.c

@@ -146,7 +146,6 @@ typedef struct pltcl_proc_desc
 	Oid			result_typid;	/* OID of fn's result type */
 	FmgrInfo	result_in_func; /* input function for fn's result type */
 	Oid			result_typioparam;	/* param to pass to same */
-	bool		fn_is_procedure;	/* true if this is a procedure */
 	bool		fn_retisset;	/* true if function returns a set */
 	bool		fn_retistuple;	/* true if function returns composite */
 	bool		fn_retisdomain; /* true if function returns domain */
@@ -982,7 +981,7 @@ pltcl_func_handler(PG_FUNCTION_ARGS, pltcl_call_state *call_state,
 		retval = (Datum) 0;
 		fcinfo->isnull = true;
 	}
-	else if (fcinfo->isnull && !prodesc->fn_is_procedure)
+	else if (fcinfo->isnull)
 	{
 		retval = InputFunctionCall(&prodesc->result_in_func,
 								   NULL,
@@ -1040,13 +1039,11 @@ pltcl_func_handler(PG_FUNCTION_ARGS, pltcl_call_state *call_state,
 									   call_state);
 		retval = HeapTupleGetDatum(tup);
 	}
-	else if (!prodesc->fn_is_procedure)
+	else
 		retval = InputFunctionCall(&prodesc->result_in_func,
 								   utf_u2e(Tcl_GetStringResult(interp)),
 								   prodesc->result_typioparam,
 								   -1);
-	else
-		retval = 0;
 
 	return retval;
 }
@@ -1523,9 +1520,7 @@ compile_pltcl_function(Oid fn_oid, Oid tgreloid,
 		 * Get the required information for input conversion of the
 		 * return value.
 		 ************************************************************/
-		prodesc->fn_is_procedure = (procStruct->prokind == PROKIND_PROCEDURE);
-
-		if (!is_trigger && !is_event_trigger && !prodesc->fn_is_procedure)
+		if (!is_trigger && !is_event_trigger)
 		{
 			Oid			rettype = procStruct->prorettype;
 
@@ -2218,7 +2213,7 @@ pltcl_returnnext(ClientData cdata, Tcl_Interp *interp,
 				tuplestore_puttuple(call_state->tuple_store, tuple);
 			}
 		}
-		else if (!prodesc->fn_is_procedure)
+		else
 		{
 			Datum		retval;
 			bool		isNull = false;