staging: mt7621-pci: initialize 'n' variable when it is declared

Variable 'n' in 'mt7621_pcie_init_virtual_bridges' function
can be directly initialized when it is declared instead of
doing it before using it first.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Link: https://lore.kernel.org/r/20200413155018.31921-3-sergio.paracuellos@gmail.com


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