Avoid unnecessary conversions

No need to convert here, they are already of the right type.

cmd/bbolt/main.go

@@ -774,7 +774,7 @@ func (cmd *PageCommand) PrintFreelist(w io.Writer, buf []byte) error {
 
 	// Print each page in the freelist.
 	ids := (*[maxAllocSize]pgid)(unsafe.Pointer(&p.ptr))
-	for i := int(idx); i < count; i++ {
+	for i := idx; i < count; i++ {
 		fmt.Fprintf(w, "%d\n", ids[i])
 	}
 	fmt.Fprintf(w, "\n")

cursor.go

@@ -366,7 +366,7 @@ func (c *Cursor) node() *node {
 	}
 	for _, ref := range c.stack[:len(c.stack)-1] {
 		_assert(!n.isLeaf, "expected branch node")
-		n = n.childAt(int(ref.index))
+		n = n.childAt(ref.index)
 	}
 	_assert(n.isLeaf, "expected leaf node")
 	return n

freelist_hmap.go

@@ -27,7 +27,7 @@ func (f *freelist) hashmapAllocate(txid txid, n int) pgid {
 			f.allocs[pid] = txid
 
 			for i := pgid(0); i < pgid(n); i++ {
-				delete(f.cache, pid+pgid(i))
+				delete(f.cache, pid+i)
 			}
 			return pid
 		}