idpf: Fix mailbox IRQ name leak on request failure

idpf: Fix mailbox IRQ name leak on request failure

idpf_mb_intr_req_irq() allocates the mailbox IRQ name before calling
request_irq(). On success, the name is released later through
kfree(free_irq()), but request_irq() failure returns without freeing it.

Free the allocated name on the request_irq() failure path.

Fixes: 4930fbf419a7 ("idpf: add core init and interrupt request")
Signed-off-by: Yuho Choi <dbgh9129@gmail.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Tested-by: Samuel Salin <Samuel.salin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>