[PATCH] allow device specification to be a symlink

[Nick Black]

I posted this to
https://gitlab.freedesktop.org/mobile-broadband/libqmi/issues/10,
but am unsure as to whether that's monitored.

When a valid symlink to a device node exists, qmicli still fails
to determine the driver and wwan interface corresponding to the
dereferenced symlink. This is due to using the -d argument's
basename as an index into sysfs.

uptowngirl $ ls -l /dev/cdc-huawei
 lrwxrwxrwx 1 root root 8 Mar  4 02:02 /dev/cdc-huawei -> cdc-wdm0
uptowngirl $ sudo qmicli -d /dev/cdc-huawei -w
 [04 Mar 2019, 02:16:05] -Warning ** [/dev/cdc-huawei] couldn't load driver of cdc-wdm port
 error: couldn't open the QmiDevice: Cannot automatically select QMI/MBIM mode: driver unknown
uptowngirl $

I've added code to check for a symlink, and dereference it if
so. Please request changes or merge. Thanks!

-- 
nick black -=- https://www.nick-black.com
to make an apple pie from scratch, you need first invent a universe.
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