pkg/sensors: fix kprobeEntry.pinPathPrefix for multi kprobes

Here is the issue, for example:
- In the case of simple kprobe: map name is: `gkp-sensor-1-gkp-0-name_map`
  with `gk.pinPathPrefix = gkp-sensor-1-gkp-0`
- In the case of multi kprobe: map name is `gkp-sensor-1-multi_kprobe-name_map`
  with `gk.pinPathPrefix = gkp-sensor-1` in the second.

In the case of multi kprobe, the pinPathPrefix is wrong, it should be
`gk.pinPathPrefix = gkp-sensor-1-multi_kprobe`.

Signed-off-by: Mahe Tardy <mahe.tardy@gmail.com>

pkg/sensors/tracing/generickprobe.go

@@ -756,10 +756,10 @@ func addKprobe(funcName string, f *v1alpha1.KProbeSpec, in *addKprobeIn) (out *a
 	genericKprobeTable.AddEntry(&kprobeEntry)
 	tidx := kprobeEntry.tableId.ID
 	out.tableEntryIndex = tidx
-	kprobeEntry.pinPathPrefix = sensors.PathJoin(in.sensorPath, fmt.Sprintf("gkp-%d", tidx))
 	config.FuncId = uint32(tidx)
 
 	if in.useMulti {
+		kprobeEntry.pinPathPrefix = sensors.PathJoin(in.sensorPath, "multi_kprobe")
 		if setRetprobe {
 			out.multiRetIDs = append(out.multiRetIDs, kprobeEntry.tableId)
 		}
@@ -772,6 +772,7 @@ func addKprobe(funcName string, f *v1alpha1.KProbeSpec, in *addKprobeIn) (out *a
 		return out, nil
 	}
 
+	kprobeEntry.pinPathPrefix = sensors.PathJoin(in.sensorPath, fmt.Sprintf("gkp-%d", tidx))
 	pinPath := kprobeEntry.pinPathPrefix
 	pinProg := sensors.PathJoin(pinPath, fmt.Sprintf("%s_prog", kprobeEntry.funcName))