"irq" in vmur's int handler can be an error pointer. Don't dereference
this pointer in that case.
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>