Fix clang warnings

Author: Artur Zakirov

rumdatapage.c

@@ -1110,13 +1110,11 @@ dataSplitPageLeaf(RumBtree btree, Buffer lbuf, Buffer rbuf,
 		}
 		else
 		{
-			prevTotalsize = totalsize;
 			totalsize = rumCheckPlaceToDataPageLeaf(btree->entryAttnum,
 							   &item, &prevIptr, btree->rumstate, totalsize);
 			maxItemIndex++;
 
 			totalCount++;
-			maxItemSize = Max(maxItemSize, totalsize - prevTotalsize);
 		}
 	}
 

rumentrypage.c

@@ -445,7 +445,6 @@ entrySplitPage(RumBtree btree, Buffer lbuf, Buffer rbuf,
 	{
 		size = MAXALIGN(IndexTupleSize(btree->entry));
 		memcpy(ptr, btree->entry, size);
-		ptr += size;
 		totalsize += size + sizeof(ItemIdData);
 	}
 

rumtsquery.c

@@ -269,7 +269,7 @@ extract_wraps(QueryItemWrap * wrap, ExtractContext * context, int level)
 	{
 		bytea	   *addinfo;
 		unsigned char *ptr;
-		int			index = context->index;
+		int			index;
 
 
 		for (index = 0; index < context->index; index++)