cmd/link: remove unnecessary type conversion for nitablinks

It's already an uint64.

Change-Id: Ic4cdb957aa4f9245c1ea3f946bcb740f116dd04b
Reviewed-on: https://go-review.googlesource.com/c/go/+/253679
Run-TryBot: Cuong Manh Le <[email protected]>
Reviewed-by: Than McIntosh <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>

Author: cuonglm

src/cmd/link/internal/ld/symtab.go

@@ -681,8 +681,8 @@ func (ctxt *Link) symtab(pcln *pclntab) []sym.SymKind {
 	itablinkSym := ldr.Lookup("runtime.itablink", 0)
 	nitablinks := uint64(ldr.SymSize(itablinkSym)) / uint64(ctxt.Arch.PtrSize)
 	moduledata.AddAddr(ctxt.Arch, itablinkSym)
-	moduledata.AddUint(ctxt.Arch, uint64(nitablinks))
-	moduledata.AddUint(ctxt.Arch, uint64(nitablinks))
+	moduledata.AddUint(ctxt.Arch, nitablinks)
+	moduledata.AddUint(ctxt.Arch, nitablinks)
 	// The ptab slice
 	if ptab := ldr.Lookup("go.plugin.tabs", 0); ptab != 0 && ldr.AttrReachable(ptab) {
 		ldr.SetAttrLocal(ptab, true)