pkg/proc/internal/ebpf: remove redundant nil check (#3502)

From the Go specification:

  "1. For a nil slice, the number of iterations is 0." [1]

Therefore, an additional nil check for before the loop is unnecessary.

[1]: https://go.dev/ref/spec#For_range

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

pkg/proc/internal/ebpf/helpers.go

@@ -71,10 +71,8 @@ func (ctx *EBPFContext) Close() {
 	if ctx.objs != nil {
 		ctx.objs.Close()
 	}
-	if ctx.links != nil {
+	for _, l := range ctx.links {
-		for _, l := range ctx.links {
+		l.Close()
-			l.Close()
-		}
 	}
 }