account-widget: Fix 'login_id' leak in _get_default_display_name()
account-widget: Fix 'login_id' leak in _get_default_display_name()

tpaw_account_get_default_display_name() returns early when login_id is non-NULL, and
only tries to g_free() it in the codepath after this early return, which causes a leak.
This commit moves the call to g_free (login_id) before the early return in the
(login_id != NULL) case. This fixes:

==26855== 8 bytes in 1 blocks are definitely lost in loss record 13,180 of 34,041
==26855==    at 0x4A06C50: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==26855==    by 0x8A120AC: g_malloc (gmem.c:97)
==26855==    by 0x8A123C5: g_malloc_n (gmem.c:336)
==26855==    by 0x8A2DB9A: g_strdup (gstrfuncs.c:356)
==26855==    by 0x8A4C05B: g_variant_dup_string (gvariant.c:1500)
==26855==    by 0x4CB9B41: tpaw_account_settings_dup_string (tpaw-account-settings.c:843)
==26855==    by 0x4CC0F8B: tpaw_account_widget_get_default_display_name (tpaw-account-widget.c:2155)
==26855==    by 0x4CBDFE2: tpaw_account_widget_apply_and_log_in (tpaw-account-widget.c:999)
==26855==    by 0x4CBE05C: account_widget_apply_clicked_cb (tpaw-account-widget.c:1017)
==26855==    by 0x87741EA: g_cclosure_marshal_VOID__VOID (gmarshal.c:875)
==26855==    by 0x8771238: g_closure_invoke (gclosure.c:801)
==26855==    by 0x878E070: signal_emit_unlocked_R (gsignal.c:3581)
==26855==    by 0x878D3A7: g_signal_emit_valist (gsignal.c:3337)
==26855==    by 0x878D8E9: g_signal_emit (gsignal.c:3393)
==26855==    by 0x7326A22: gtk_button_clicked (gtkbutton.c:1488)
==26855==    by 0x7327943: gtk_button_do_release (gtkbutton.c:1899)
==26855==    by 0x7327D22: gtk_real_button_released (gtkbutton.c:2017)
==26855==    by 0x877427D: g_cclosure_marshal_VOID__VOIDv (gmarshal.c:905)
==26855==    by 0x877190F: g_type_class_meta_marshalv (gclosure.c:1021)
==26855==    by 0x87714D1: _g_closure_invoke_va (gclosure.c:864)
==26855==    by 0x878C771: g_signal_emit_valist (gsignal.c:3246)
==26855==    by 0x878D8E9: g_signal_emit (gsignal.c:3393)
==26855==    by 0x73244D2: multipress_released_cb (gtkbutton.c:613)
==26855==    by 0x36E5A05DAF: ffi_call_unix64 (unix64.S:76)
==26855==    by 0x36E5A05817: ffi_call (ffi64.c:525)
==26855==    by 0x8772F7C: g_cclosure_marshal_generic_va (gclosure.c:1594)
==26855==    by 0x87714D1: _g_closure_invoke_va (gclosure.c:864)
==26855==    by 0x878C771: g_signal_emit_valist (gsignal.c:3246)
==26855==    by 0x878D8E9: g_signal_emit (gsignal.c:3393)
==26855==    by 0x7421792: gtk_gesture_multi_press_end (gtkgesturemultipress.c:273)
==26855==    by 0x8775B90: g_cclosure_marshal_VOID__BOXEDv (gmarshal.c:1950)
==26855==    by 0x877190F: g_type_class_meta_marshalv (gclosure.c:1021)
==26855==    by 0x87714D1: _g_closure_invoke_va (gclosure.c:864)
==26855==    by 0x878C771: g_signal_emit_valist (gsignal.c:3246)

https://bugzilla.gnome.org/show_bug.cgi?id=752938

GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets