qemuProcessHandleMemoryDeviceSizeChange: Use qemuProcessEventSubmit()
qemuProcessHandleMemoryDeviceSizeChange: Use qemuProcessEventSubmit()

This is a typical example of what can go wrong when sending out
an old patch. Back in January, when I was writing
qemuProcessHandleMemoryDeviceSizeChange() events were sent to the
worker pool thread using virThreadPoolSendJob(). Then, in July a
helper was introduced (qemuProcessEventSubmit()) but since my
code was not committed and I did not pay attention my code wasn't
updated. Later, when I merged my code it uses the old approach.

BTW: this also fixes a possible double free which I completely
missed when writing the code ~10 months ago.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>
Reviewed-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>

nertpinx/libvirt,nertpinx/libvirt,libvirt/libvirt,olafhering/libvirt,jfehlig/libvirt,zippy2/libvirt,crobinso/libvirt,crobinso/libvirt,nertpinx/libvirt,crobinso/libvirt,olafhering/libvirt,jfehlig/libvirt,zippy2/libvirt,libvirt/libvirt,libvirt/libvirt,nertpinx/libvirt,jfehlig/libvirt,crobinso/libvirt,jfehlig/libvirt,zippy2/libvirt,olafhering/libvirt,libvirt/libvirt,nertpinx/libvirt,zippy2/libvirt,olafhering/libvirt