staging: gpib: fix prefixing 0x with decimal output

* pr_err() of request_region() in cb7210 uses 0x%u which is defective.
* The config->ibbase is of u32 and correct prefix is 0x%x.
* This error reported by checkpatch with below message:
  ERROR: Prefixing 0x with decimal output is defective

Signed-off-by: Ajith P V <ajithpv.linux@gmail.com>
Link: https://lore.kernel.org/r/20250114121656.30577-1-ajithpv.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>