net: fec: remove redundant variable 'inc'

Variable 'inc' is being assigned but is never used hence it is
redundant and can be removed.

Cleans up clang warning:
warning: variable 'inc' set but not used [-Wunused-but-set-variable]

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>