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adapter: Fix memory leak on discovery cleanup
During discovery cleanup, it was attempted to send a DevicesFound()
D-Bus signal for pending found devices, but adapter->discovery was set
to NULL before calling send_devices_found(), therefore it never sent any
signal (and there was a leak of discovery->pending list).
Fixes this memory leak when pairing two LE devices:
==1822== 8 bytes in 1 blocks are definitely lost in loss record 42 of
246
==1822== at 0x482BE68: malloc (in
/usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==1822== by 0x48869AA: standard_malloc (gmem.c:85)
==1822== by 0x4886E42: g_malloc (gmem.c:159)
==1822== by 0x489B26D: g_slice_alloc (gslice.c:1003)
==1822== by 0x489C10A: g_slist_prepend (gslist.c:265)
==1822== by 0x1855AE: adapter_update_found_devices (adapter.c:2846)
==1822== by 0x191431: btd_event_device_found (event.c:260)
==1822== by 0xBC01001A: ???
==1822==