[Bug 789983] gstdevicemonitor: Avoid maybe-uninitialized error

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789983

Tim-Philipp Müller <t.i.m at zen.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |t.i.m at zen.co.uk
         Resolution|---                         |FIXED
   Target Milestone|git master                  |1.13.1

--- Comment #1 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
Thanks, pushed with modifications - I wasn't entirely convinced that inverting
the hidden check makes the code clearer. Hope you don't mind :)

commit d9b20492f328cd89b618de00374e6999ddf45876 (HEAD -> master)
Author: Jan Alexander Steffens (heftig) <jan.steffens at gmail.com>
Date:   Mon Nov 6 20:23:12 2017 +0100

    devicemonitor: Avoid maybe-uninitialized compiler warning

    On Arch Linux x86_64, gcc 7.2.0-3, -Og -g3:

    gstdevicemonitor.c: In function ‘bus_sync_message’:
    gstdevicemonitor.c:276:8: error: ‘matches’ may be used uninitialized in
this function [-Werror=maybe-uninitialized]

    This commit also simplifies the code a bit.

    https://bugzilla.gnome.org/show_bug.cgi?id=789983

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