Remove condiation that can never happen

retArgs always has index ReturnArgIndex. So, it's never the case that we
need put the arg in a specific position. It's always last.

Signed-off-by: Andy Strohman <[email protected]>

Author: andrewstrohman

pkg/sensors/tracing/generickprobe.go

@@ -1491,12 +1491,7 @@ func retprobeMerge[T evArgsRetriever](prev pendingEvent[T], curr pendingEvent[T]
 	retArgs := retEv.GetArgs()
 	enterArgs := enterEv.GetArgs()
 	for _, retArg := range *retArgs {
-		index := retArg.GetIndex()
-		if uint64(len(*enterArgs)) > index {
-			(*enterArgs)[index] = retArg
-		} else {
-			*enterArgs = append(*enterArgs, retArg)
-		}
+		*enterArgs = append(*enterArgs, retArg)
 	}
 	return enterEv, retEv
 }