PCI: hv: Remove unnecessary use of %hx

PCI: hv: Remove unnecessary use of %hx

"dom_req" is a u16 but varargs automatically promotes it to int, so there's
no point in using the %h modifier.  Drop it.

See cbacb5ab0aa0 ("docs: printk-formats: Stop encouraging use of
unnecessary %h[xudi] and %hh[xudi]") and 70eb2275ff8e ("checkpatch: add
warning for unnecessary use of %h[xudi] and %hh[xudi]").

Link: https://lore.kernel.org/r/20211008222732.2868493-1-kw@linux.com
Signed-off-by: Krzysztof Wilczyński <kw@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>