Philip Withnall 9c66880af0
gdbusconnection: Fix a crash on arg0 matching
If a connection has two signal subscriptions active for the same signal,
one with arg0 matching and one without, a signal which doesn’t contain
an arg0 value (i.e. `g_dbus_message_get_arg0()` returns `NULL`) will
cause `NULL` to be passed to `strcmp()` when checking for a match
against the signal subscription which *has* arg0 matching, causing a
crash.

Fix that by adding the obvious `NULL` check, and add a unit test.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>

Fixes: #3342
2024-05-01 10:53:22 +01:00
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