Syncronize all observers in Run()

With the introduction of a sync.WaitGroup we now wait for all observers
to finished before Run() returns

GetRuntimeAddresses/symbolyze/symbolyze.go

@@ -9,6 +9,7 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+	"sync"
 )
 
 // Scanner represents an engine for scanning for a specific symbol in all
@@ -122,6 +123,7 @@ func (S *Scanner) Run() error {
 
 	proc.Close()
 
+	var wg sync.WaitGroup
 	for _, pinfo := range infos {
 		var pid_s = pinfo.Name()
 
@@ -135,18 +137,20 @@ func (S *Scanner) Run() error {
 		} else {
 			// Notify the observers.
 			for n, observer := range S.observers {
+				wg.Add(1)
 				go func() {
 					err = observer(pid, offset)
 					if err != nil {
 						S.setErrorf("S.observer[%d] error: %v", n, err)
 						// TODO: propagate errors from all Observers.
 					}
-
+					wg.Done()
 				}()
 			}
 		}
 	}
 
+	wg.Wait()
 	return S.err
 }