staging: mt7621-pci: directly return 'mt7621_pcie_register_host'

staging: mt7621-pci: directly return 'mt7621_pcie_register_host'

Return code after call function 'mt7621_pcie_register_host' is
being checked to give an error message. This function internally
is calling 'pci_host_probe' which if something fails will complain
already. Hence, directly return result of this call making decrease
a bit LOC.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Link: https://lore.kernel.org/r/20210505121736.6459-7-sergio.paracuellos@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>