Remove unnecessary casts of makeNode() result

makeNode() is already a macro that has the right result pointer type, so
casting it again to the same type is unnecessary.

src/backend/commands/tablecmds.c

@@ -12743,7 +12743,7 @@ transformPartitionSpec(Relation rel, PartitionSpec *partspec, char *strategy)
 	RangeTblEntry *rte;
 	ListCell   *l;
 
-	newspec = (PartitionSpec *) makeNode(PartitionSpec);
+	newspec = makeNode(PartitionSpec);
 
 	newspec->strategy = partspec->strategy;
 	newspec->location = partspec->location;

src/backend/executor/execQual.c

@@ -4594,16 +4594,16 @@ ExecInitExpr(Expr *node, PlanState *parent)
 			}
 			else
 			{
-				state = (ExprState *) makeNode(ExprState);
+				state = makeNode(ExprState);
 				state->evalfunc = ExecEvalScalarVar;
 			}
 			break;
 		case T_Const:
-			state = (ExprState *) makeNode(ExprState);
+			state = makeNode(ExprState);
 			state->evalfunc = ExecEvalConst;
 			break;
 		case T_Param:
-			state = (ExprState *) makeNode(ExprState);
+			state = makeNode(ExprState);
 			switch (((Param *) node)->paramkind)
 			{
 				case PARAM_EXEC:
@@ -4619,11 +4619,11 @@ ExecInitExpr(Expr *node, PlanState *parent)
 			}
 			break;
 		case T_CoerceToDomainValue:
-			state = (ExprState *) makeNode(ExprState);
+			state = makeNode(ExprState);
 			state->evalfunc = ExecEvalCoerceToDomainValue;
 			break;
 		case T_CaseTestExpr:
-			state = (ExprState *) makeNode(ExprState);
+			state = makeNode(ExprState);
 			state->evalfunc = ExecEvalCaseTestExpr;
 			break;
 		case T_Aggref:
@@ -5176,7 +5176,7 @@ ExecInitExpr(Expr *node, PlanState *parent)
 			}
 			break;
 		case T_SQLValueFunction:
-			state = (ExprState *) makeNode(ExprState);
+			state = makeNode(ExprState);
 			state->evalfunc = ExecEvalSQLValueFunction;
 			break;
 		case T_XmlExpr:
@@ -5250,7 +5250,7 @@ ExecInitExpr(Expr *node, PlanState *parent)
 			}
 			break;
 		case T_CurrentOfExpr:
-			state = (ExprState *) makeNode(ExprState);
+			state = makeNode(ExprState);
 			state->evalfunc = ExecEvalCurrentOfExpr;
 			break;
 		case T_TargetEntry:

src/backend/replication/repl_gram.y

@@ -131,8 +131,7 @@ identify_system:
 base_backup:
 			K_BASE_BACKUP base_backup_opt_list
 				{
-					BaseBackupCmd *cmd =
-						(BaseBackupCmd *) makeNode(BaseBackupCmd);
+					BaseBackupCmd *cmd = makeNode(BaseBackupCmd);
 					cmd->options = $2;
 					$$ = (Node *) cmd;
 				}

src/backend/rewrite/rowsecurity.c

@@ -703,7 +703,7 @@ add_with_check_options(Relation rel,
 		 */
 		WithCheckOption *wco;
 
-		wco = (WithCheckOption *) makeNode(WithCheckOption);
+		wco = makeNode(WithCheckOption);
 		wco->kind = kind;
 		wco->relname = pstrdup(RelationGetRelationName(rel));
 		wco->polname = NULL;
@@ -735,7 +735,7 @@ add_with_check_options(Relation rel,
 				qual = copyObject(qual);
 				ChangeVarNodes((Node *) qual, 1, rt_index, 0);
 
-				wco = (WithCheckOption *) makeNode(WithCheckOption);
+				wco = makeNode(WithCheckOption);
 				wco->kind = kind;
 				wco->relname = pstrdup(RelationGetRelationName(rel));
 				wco->polname = pstrdup(policy->policy_name);
@@ -755,7 +755,7 @@ add_with_check_options(Relation rel,
 		 */
 		WithCheckOption *wco;
 
-		wco = (WithCheckOption *) makeNode(WithCheckOption);
+		wco = makeNode(WithCheckOption);
 		wco->kind = kind;
 		wco->relname = pstrdup(RelationGetRelationName(rel));
 		wco->polname = NULL;