Fix memory leak

Fix memory leak

[Problem] There are some memory leak in code
[Cause & Measure] Fix memory leak

324 bytes in 18 blocks are definitely lost in loss record 1,471 of 1,512
at 0x48458E8: malloc (vg_replace_malloc.c:299)
by 0x4B9E271: g_variant_get (gvariant.c:5368)
by 0x12DAC5: _bt_get_remote_device_info_by_object_path (bt-service-device.c:516)
by 0x11A295: __bt_device_property_changed_event (bt-service-event-receiver.c:1076)
by 0x11A295: _bt_handle_property_changed_event (bt-service-event-receiver.c:1403)
by 0x11D235: __bt_manager_event_filter (bt-service-event-receiver.c:2885)

504 bytes in 72 blocks are definitely lost in loss record 1,479 of 1,512
at 0x48458E8: malloc (vg_replace_malloc.c:299)
by 0x4B9E271: g_variant_get (gvariant.c:5368)
by 0x12579D: __bt_get_bonded_device_info (bt-service-adapter.c:374)
by 0x12579D: _bt_get_bonded_device_info (bt-service-adapter.c:3153)
by 0x143815: __bt_bluez_request (bt-request-handler.c:880)
by 0x147439: __bt_service_method (bt-request-handler.c:275)

648 bytes in 36 blocks are definitely lost in loss record 1,486 of 1,512
at 0x48458E8: malloc (vg_replace_malloc.c:299)
by 0x4B9E271: g_variant_get (gvariant.c:5368)
by 0x13402F: _bt_get_device_ida (bt-service-device.c:3563)
by 0x1449ED: __bt_bluez_request (bt-request-handler.c:1792)
by 0x147439: __bt_service_method (bt-request-handler.c:275)

1,008 bytes in 36 blocks are definitely lost in loss record 1,490 of 1,512
at 0x48458E8: malloc (vg_replace_malloc.c:299)
by 0x4B79E89: g_malloc (gmem.c:97)
by 0x4B89755: g_slice_alloc (gslice.c:1007)
by 0x4B5664B: g_array_sized_new (garray.c:193)
by 0x147191: __bt_service_method (bt-request-handler.c:220)

21,852 bytes in 1,214 blocks are definitely lost in loss record 1,509 of 1,512
at 0x48458E8: malloc (vg_replace_malloc.c:299)
by 0x4B9E271: g_variant_get (gvariant.c:5368)
by 0x11B96D: _bt_handle_device_event (bt-service-event-receiver.c:2200)
by 0x11D8B1: __bt_manager_event_filter (bt-service-event-receiver.c:2897)

22,662 (432 direct, 22,230 indirect) bytes in 18 blocks are definitely lost in loss record 1,511 of 1,512
at 0x48458E8: malloc (vg_replace_malloc.c:299)
by 0x4B9E271: g_variant_get (gvariant.c:5368)
by 0x11D17D: __bt_manager_event_filter (bt-service-event-receiver.c:2679)

Change-Id: Ib00c46ac04eff5d62b94bbf31876bd06dac6aa2a
Signed-off-by: Seungyoun Ju <sy39.ju@samsung.com>