A2DP: Fix invalid write

A2DP: Fix invalid write

Invalid write of size 8
   at 0x41F297: setconf_cfm (a2dp.c:567)
   by 0x42526B: session_cb (avdtp.c:3176)
   by 0x39B0847A54: g_main_context_dispatch (in /usr/lib64/libglib-2.0.so.0.3400.2)
   by 0x39B0847D87: ??? (in /usr/lib64/libglib-2.0.so.0.3400.2)
   by 0x39B0848181: g_main_loop_run (in /usr/lib64/libglib-2.0.so.0.3400.2)
   by 0x409C3E: main (main.c:583)
 Address 0x555fda8 is 40 bytes inside a block of size 88 free'd
   at 0x4A077A6: free (vg_replace_malloc.c:446)
   by 0x39B084D79E: g_free (in /usr/lib64/libglib-2.0.so.0.3400.2)
   by 0x41E217: setup_cb_free (a2dp.c:191)
   by 0x41E410: finalize_config (a2dp.c:234)
   by 0x41F296: setconf_cfm (a2dp.c:566)
   by 0x42526B: session_cb (avdtp.c:3176)
   by 0x39B0847A54: g_main_context_dispatch (in /usr/lib64/libglib-2.0.so.0.3400.2)
   by 0x39B0847D87: ??? (in /usr/lib64/libglib-2.0.so.0.3400.2)
   by 0x39B0848181: g_main_loop_run (in /usr/lib64/libglib-2.0.so.0.3400.2)
   by 0x409C3E: main (main.c:583)