Remove useless casts to (void *) in arguments of some system functions

The affected functions are: bsearch, memcmp, memcpy, memset, memmove,
qsort, repalloc

Reviewed-by: Corey Huinker <corey.huinker@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/fd9adf5d-b1aa-e82f-e4c7-263c30145807%40enterprisedb.com

src/backend/statistics/extended_stats.c

@@ -1129,7 +1129,7 @@ build_sorted_items(StatsBuildData *data, int *nitems,
 	}
 
 	/* do the sort, using the multi-sort */
-	qsort_interruptible((void *) items, nrows, sizeof(SortItem),
+	qsort_interruptible(items, nrows, sizeof(SortItem),
 						multi_sort_compare, mss);
 
 	return items;

src/backend/statistics/mcv.c

@@ -457,7 +457,7 @@ build_distinct_groups(int numrows, SortItem *items, MultiSortSupport mss,
 	Assert(j + 1 == ngroups);
 
 	/* Sort the distinct groups by frequency (in descending order). */
-	qsort_interruptible((void *) groups, ngroups, sizeof(SortItem),
+	qsort_interruptible(groups, ngroups, sizeof(SortItem),
 						compare_sort_item_count, NULL);
 
 	*ndistinct = ngroups;
@@ -528,7 +528,7 @@ build_column_frequencies(SortItem *groups, int ngroups,
 		}
 
 		/* sort the values, deduplicate */
-		qsort_interruptible((void *) result[dim], ngroups, sizeof(SortItem),
+		qsort_interruptible(result[dim], ngroups, sizeof(SortItem),
 							sort_item_compare, ssup);
 
 		/*

src/backend/statistics/mvdistinct.c

@@ -489,7 +489,7 @@ ndistinct_for_combination(double totalrows, StatsBuildData *data,
 	}
 
 	/* We can sort the array now ... */
-	qsort_interruptible((void *) items, numrows, sizeof(SortItem),
+	qsort_interruptible(items, numrows, sizeof(SortItem),
 						multi_sort_compare, mss);
 
 	/* ... and count the number of distinct combinations */