admin: Remove unnecessary @conn object locking

The only place we change the @conn object is actually virAdmConnectOpen
routine, thus at the moment we don't really need to lock it, given the fact that
what we're trying to do here is to change the closeCallback object which is a
lockable object itself, so that should be enough to avoid races.
Signed-off-by: NErik Skultety <eskultet@redhat.com>

src/libvirt-admin.c

@@ -465,7 +465,6 @@ int virAdmConnectRegisterCloseCallback(virAdmConnectPtr conn,
 
     virObjectRef(conn);
 
-    virObjectLock(conn);
     virObjectLock(conn->closeCallback);
 
     virCheckNonNullArgGoto(cb, error);
@@ -482,13 +481,11 @@ int virAdmConnectRegisterCloseCallback(virAdmConnectPtr conn,
     conn->closeCallback->freeCallback = freecb;
 
     virObjectUnlock(conn->closeCallback);
-    virObjectUnlock(conn);
 
     return 0;
 
  error:
     virObjectUnlock(conn->closeCallback);
-    virObjectUnlock(conn);
     virDispatchError(NULL);
     virObjectUnref(conn);
     return -1;
@@ -517,7 +514,6 @@ int virAdmConnectUnregisterCloseCallback(virAdmConnectPtr conn,
 
     virCheckAdmConnectReturn(conn, -1);
 
-    virObjectLock(conn);
     virObjectLock(conn->closeCallback);
 
     virCheckNonNullArgGoto(cb, error);
@@ -534,14 +530,12 @@ int virAdmConnectUnregisterCloseCallback(virAdmConnectPtr conn,
     conn->closeCallback->freeCallback = NULL;
 
     virObjectUnlock(conn->closeCallback);
-    virObjectUnlock(conn);
     virObjectUnref(conn);
 
     return 0;
 
  error:
     virObjectUnlock(conn->closeCallback);
-    virObjectUnlock(conn);
     virDispatchError(NULL);
     return -1;
 }