Update count when Lock() is called (#807)

This is important as it will unable to delete lock from sync pool if `isNew` is false.

Author: lpoli

code/go/0chain.net/core/common/lock.go

@@ -19,6 +19,9 @@ type Lock struct {
 
 // Lock Acquire lock
 func (l *Lock) Lock() {
+l.countMu.Lock()
+l.count++
+l.countMu.Unlock()
 for {
 l.actualLock.Lock()
 if l.stale {
@@ -53,15 +56,11 @@ func (m *MapLocker) GetLock(key string) (l *Lock, isNew bool) {
 valueI, ok := m.m.Load(key)
 if ok {
 l = valueI.(*Lock)
-l.countMu.Lock()
-l.count++
-l.countMu.Unlock()
 return
 }
 
 l = &Lock{
 key: key,
-count: 1,
 pMap: m,
 actualLock: new(sync.Mutex),
 countMu: new(sync.Mutex),