Remove useless casts to (void *)

Their presence causes (small) risks of hiding actual type mismatches
or silently discarding qualifiers.  Some have been missed in
7f798aca1d and some are new ones along the same lines.

Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/aR8Yv%2BuATLKbJCgI%40ip-10-97-1-34.eu-west-3.compute.internal

src/backend/catalog/pg_publication.c

@@ -1369,7 +1369,7 @@ pg_get_publication_sequences(PG_FUNCTION_ARGS)
 		if (publication->allsequences)
 			sequences = GetAllPublicationRelations(RELKIND_SEQUENCE, false);
 
-		funcctx->user_fctx = (void *) sequences;
+		funcctx->user_fctx = sequences;
 
 		MemoryContextSwitchTo(oldcontext);
 	}

src/backend/commands/copyfromparse.c

@@ -335,7 +335,7 @@ CopyGetData(CopyFromState cstate, void *databuf, int minread, int maxread)
 				if (avail > maxread)
 					avail = maxread;
 				pq_copymsgbytes(cstate->fe_msgbuf, databuf, avail);
-				databuf = (void *) ((char *) databuf + avail);
+				databuf = (char *) databuf + avail;
 				maxread -= avail;
 				bytesread += avail;
 			}

src/backend/commands/extension.c

@@ -931,7 +931,7 @@ execute_sql_string(const char *sql, const char *filename)
 	callback_arg.stmt_len = -1;
 
 	scripterrcontext.callback = script_error_callback;
-	scripterrcontext.arg = (void *) &callback_arg;
+	scripterrcontext.arg = &callback_arg;
 	scripterrcontext.previous = error_context_stack;
 	error_context_stack = &scripterrcontext;
 

src/backend/storage/lmgr/lock.c

@@ -1943,7 +1943,7 @@ WaitOnLock(LOCALLOCK *locallock, ResourceOwner owner)
 
 	/* Setup error traceback support for ereport() */
 	waiterrcontext.callback = waitonlock_error_callback;
-	waiterrcontext.arg = (void *) locallock;
+	waiterrcontext.arg = locallock;
 	waiterrcontext.previous = error_context_stack;
 	error_context_stack = &waiterrcontext;
 

src/backend/tsearch/wparser.c

@@ -204,7 +204,7 @@ prs_setup_firstcall(FuncCallContext *funcctx, FunctionCallInfo fcinfo,
 	st->len = st->cur;
 	st->cur = 0;
 
-	funcctx->user_fctx = (void *) st;
+	funcctx->user_fctx = st;
 	if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
 		elog(ERROR, "return type must be a row type");
 	funcctx->tuple_desc = tupdesc;

src/backend/utils/cache/inval.c

@@ -1480,7 +1480,7 @@ CacheInvalidateHeapTupleCommon(Relation relation,
 	else
 		PrepareToInvalidateCacheTuple(relation, tuple, newtuple,
 									  RegisterCatcacheInvalidation,
-									  (void *) info);
+									  info);
 
 	/*
 	 * Now, is this tuple one of the primary definers of a relcache entry? See

src/backend/utils/misc/injection_point.c

@@ -186,7 +186,7 @@ injection_point_cache_load(InjectionPointEntry *entry, int slot_idx, uint64 gene
 		elog(ERROR, "could not find library \"%s\" for injection point \"%s\"",
 			 path, entry->name);
 
-	injection_callback_local = (void *)
+	injection_callback_local =
 		load_external_function(path, entry->function, false, NULL);
 
 	if (injection_callback_local == NULL)

src/backend/utils/mmgr/bump.c

@@ -407,7 +407,7 @@ BumpAllocChunkFromBlock(MemoryContext context, BumpBlock *block, Size size,
 #ifdef MEMORY_CONTEXT_CHECKING
 	chunk = (MemoryChunk *) block->freeptr;
 #else
-	ptr = (void *) block->freeptr;
+	ptr = block->freeptr;
 #endif
 
 	/* point the freeptr beyond this chunk */

src/backend/utils/sort/tuplesortvariants.c

@@ -1954,7 +1954,7 @@ readtup_index_gin(Tuplesortstate *state, SortTuple *stup,
 	LogicalTapeReadExact(tape, tuple, tuplen);
 	if (base->sortopt & TUPLESORT_RANDOMACCESS) /* need trailing length word? */
 		LogicalTapeReadExact(tape, &tuplen, sizeof(tuplen));
-	stup->tuple = (void *) tuple;
+	stup->tuple = tuple;
 
 	/* no abbreviations (FIXME maybe use attrnum for this?) */
 	stup->datum1 = (Datum) 0;