staging: qlge: replace pr_err with netdev_err

Replace all pr_errs with netdev_err.
Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Coiby Xu <coiby.xu@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20200627145857.15926-5-coiby.xu@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>