Shrink uio_num_from_filename()
Shrink uio_num_from_filename()

With the help of strstr() you don't have to look twice to determine what
is going on here.

Signed-off-by: Sebastian Andrzej Siewior <db043b2055cb3a47b2eb0b5aebf4e114a8c24a5a@breakpoint.cc>

Linutronix/libuio,Linutronix/libuio