Fix crash while registering player

Fix crash while registering player

Crash is caused by not removed freed player from the list:

Invalid read of size 8
   at 0x13E7B5: media_adapter_find_player (media.c:861)
   by 0x13FEBC: register_player (media.c:1561)
   by 0x120DFE: process_message (object.c:224)
   by 0x4F6E9A0: ??? (in /lib64/libdbus-1.so.3.5.6)
   by 0x4F6092F: dbus_connection_dispatch (in /lib64/libdbus-1.so.3.5.6)
   by 0x11F787: message_dispatch (mainloop.c:80)
   by 0x4C762CA: ??? (in /lib64/libglib-2.0.so.0.3000.0)
   by 0x4C74ADC: g_main_context_dispatch (in /lib64/libglib-2.0.so.0.3000.0)
   by 0x4C752D7: ??? (in /lib64/libglib-2.0.so.0.3000.0)
   by 0x4C75824: g_main_loop_run (in /lib64/libglib-2.0.so.0.3000.0)
   by 0x11EE4B: main (main.c:485)
 Address 0x642ef30 is 16 bytes inside a block of size 80 free'd
   at 0x4A0662E: free (vg_replace_malloc.c:366)
   by 0x4C7B7F2: g_free (in /lib64/libglib-2.0.so.0.3000.0)
   by 0x12D292: player_destroy (avrcp.c:1099)
   by 0x120C38: service_filter (watch.c:477)
   by 0x120950: message_filter (watch.c:527)
   by 0x4F608E5: dbus_connection_dispatch (in /lib64/libdbus-1.so.3.5.6)
   by 0x11F787: message_dispatch (mainloop.c:80)
   by 0x4C762CA: ??? (in /lib64/libglib-2.0.so.0.3000.0)
   by 0x4C74ADC: g_main_context_dispatch (in /lib64/libglib-2.0.so.0.3000.0)
   by 0x4C752D7: ??? (in /lib64/libglib-2.0.so.0.3000.0)
   by 0x4C75824: g_main_loop_run (in /lib64/libglib-2.0.so.0.3000.0)
   by 0x11EE4B: main (main.c:485)