vfio/pci: fix potential memory leak in vfio_intx_enable()

If vfio_irq_ctx_alloc() failed will lead to 'name' memory leak.

Fixes: 18c198c9 ("vfio/pci: Create persistent INTx handler")
Signed-off-by: Ye Bin <yebin10@huawei.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20240415015029.3699844-1-yebin10@huawei.com


Signed-off-by: Alex Williamson <alex.williamson@redhat.com>