misc: Drop useless checks from *Dispose() functions

Due to the way that our virObjectUnref() is written it's not
possible that a NULL is passed into *Dispose() function. However,
some functions check for that regardless.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NErik Skultety <eskultet@redhat.com>

src/conf/domain_conf.c

@@ -2602,9 +2602,6 @@ virDomainChrSourceDefDispose(void *obj)
     virDomainChrSourceDefPtr def = obj;
     size_t i;
 
-    if (!def)
-        return;
-
     virDomainChrSourceDefClear(def);
     virObjectUnref(def->privateData);
 

src/conf/virstorageobj.c

@@ -156,9 +156,6 @@ virStorageVolObjDispose(void *opaque)
 {
     virStorageVolObjPtr obj = opaque;
 
-    if (!obj)
-        return;
-
     virStorageVolDefFree(obj->voldef);
 }
 
@@ -190,9 +187,6 @@ virStorageVolObjListDispose(void *opaque)
 {
     virStorageVolObjListPtr vols = opaque;
 
-    if (!vols)
-        return;
-
     virHashFree(vols->objsKey);
     virHashFree(vols->objsName);
     virHashFree(vols->objsPath);
@@ -362,9 +356,6 @@ virStoragePoolObjDispose(void *opaque)
 {
     virStoragePoolObjPtr obj = opaque;
 
-    if (!obj)
-        return;
-
     virStoragePoolObjClearVols(obj);
     virObjectUnref(obj->volumes);
 

src/rpc/virnetsshsession.c

@@ -135,9 +135,6 @@ virNetSSHSessionDispose(void *obj)
     virNetSSHSessionPtr sess = obj;
     VIR_DEBUG("sess=0x%p", sess);
 
-    if (!sess)
-        return;
-
     if (sess->channel) {
         libssh2_channel_send_eof(sess->channel);
         libssh2_channel_close(sess->channel);

src/util/virhostdev.c

@@ -131,9 +131,6 @@ virHostdevManagerDispose(void *obj)
 {
     virHostdevManagerPtr hostdevMgr = obj;
 
-    if (!hostdevMgr)
-        return;
-
     virObjectUnref(hostdevMgr->activePCIHostdevs);
     virObjectUnref(hostdevMgr->inactivePCIHostdevs);
     virObjectUnref(hostdevMgr->activeUSBHostdevs);