pkg/compiler: refactor len target checking

Create named const for "parent" and move some code into a helper function.

1 files changed, 2 insertions, 2 deletions

diff --git a/prog/checksum.go b/prog/checksum.go
index 7a3208be2..5df0cb99a 100644
--- a/prog/checksum.go
+++ b/prog/checksum.go
@@ -114,11 +114,11 @@ func calcChecksumsCall(c *Call) (map[Arg]CsumInfo, map[Arg]struct{}) {
 }
 
 func findCsummedArg(arg Arg, typ *CsumType, parentsMap map[Arg]Arg) Arg {
-	if typ.Buf == "parent" {
+	if typ.Buf == ParentRef {
 		if csummedArg, ok := parentsMap[arg]; ok {
 			return csummedArg
 		}
-		panic(fmt.Sprintf("parent for %v is not in parents map", typ.Name()))
+		panic(fmt.Sprintf("%v for %v is not in parents map", ParentRef, typ.Name()))
 	} else {
 		for parent := parentsMap[arg]; parent != nil; parent = parentsMap[parent] {
 			// TODO(dvyukov): support template argument names as in size calculation.