adapter: Fix storing IRK causing invalid read

adapter: Fix storing IRK causing invalid read

When storing an IRK the storage file may not have been created yet
since that uses the device address which is likely changed to the
identity address causing the following trace:

Invalid read of size 8
   at 0x196452: store_irk.constprop.0 (adapter.c:8679)
   by 0x198C92: new_irk_callback (adapter.c:8737)
   by 0x1CF6DC: queue_foreach (queue.c:207)
   by 0x1D1394: process_notify (mgmt.c:308)
   by 0x1D1394: can_read_data (mgmt.c:374)
   by 0x1E0634: watch_callback (io-glib.c:157)
   by 0x4954A9E: g_main_context_dispatch (in /usr/lib64/libglib-2.0.so.0.6600.8)
   by 0x49A6A97: ??? (in /usr/lib64/libglib-2.0.so.0.6600.8)
   by 0x4954162: g_main_loop_run (in /usr/lib64/libglib-2.0.so.0.6600.8)
   by 0x1E0CD4: mainloop_run (mainloop-glib.c:66)
   by 0x1E10B1: mainloop_run_with_signal (mainloop-notify.c:188)
   by 0x12E3FC: main (main.c:1210)
 Address 0x6534418 is 8 bytes inside a block of size 16 free'd

Signed-off-by: Anuj Jain <anuj01.jain@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>