compile warnings

here's a bunch of compile warnings:

[10/35] Compiling C object 'src/25a6634@@libchatty@sta/chatty-icons.c.o'
../src/chatty-icons.c: In function ‘chatty_icon_get_buddy_icon’:
../src/chatty-icons.c:215:13: warning: ‘symbol’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  215 |       buf = gtk_icon_theme_load_icon (icon_theme,
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  216 |                                       symbol,
      |                                       ~~~~~~~
  217 |                                       size,
      |                                       ~~~~~
  218 |                                       0,
      |                                       ~~
  219 |                                       NULL);
      |                                       ~~~~~
../src/chatty-icons.c:241:5: warning: ‘color_b’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  241 |     cairo_set_source_rgb (cr, color_r, color_g, color_b);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../src/chatty-icons.c:241:5: warning: ‘color_g’ may be used uninitialized in this function [-Wmaybe-uninitialized]
../src/chatty-icons.c:241:5: warning: ‘color_r’ may be used uninitialized in this function [-Wmaybe-uninitialized]
[18/35] Compiling C object 'src/25a6634@@chatty@exe/chatty-window.c.o'
../src/chatty-window.c: In function ‘window_show_chat_info_clicked_cb’:
../src/chatty-window.c:816:3: warning: ‘dialog’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  816 |   gtk_widget_destroy (dialog);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~
../src/chatty-window.c: In function ‘window_delete_buddy_clicked_cb’:
../src/chatty-window.c:685:7: warning: ‘chat’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  685 |       purple_blist_remove_chat (chat);
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../src/chatty-window.c:663:38: warning: ‘buddy’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  663 |       chatty_history_delete_im (buddy->account->username, buddy->name);
      |                                 ~~~~~^~~~~~~~~
[20/35] Compiling C object 'src/25a6634@@chatty@exe/dialogs_chatty-new-muc-dialog.c.o'
../src/dialogs/chatty-new-muc-dialog.c: In function ‘chat_name_changed_cb’:
../src/dialogs/chatty-new-muc-dialog.c:157:23: warning: ‘buddy’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  157 |   if ((*name != '\0') && !buddy) {
      |       ~~~~~~~~~~~~~~~~^~~~~~~~~
../src/dialogs/chatty-new-muc-dialog.c:144:18: note: ‘buddy’ was declared here
  144 |   PurpleBuddy   *buddy;
      |                  ^~~~~
[21/35] Compiling C object 'src/25a6634@@chatty@exe/chatty-manager.c.o'
In file included from /usr/include/glib-2.0/glib.h:113,
                 from /usr/include/libfeedback-0.0/libfeedback.h:8,
                 from ../src/chatty-manager.c:17:
../src/chatty-manager.c: In function ‘chatty_blist_update’:
/usr/include/glib-2.0/glib/glib-autocleanups.h:28:3: warning: ‘who’ may be used uninitialized in this function [-Wmaybe-uninitialized]
   28 |   g_free (*pp);
      |   ^~~~~~~~~~~~
../src/chatty-manager.c:426:28: note: ‘who’ was declared here
  426 |   g_autofree char         *who;
      |                            ^~~
[25/35] Compiling C object 'src/25a6634@@chatty@exe/xeps_chatty-xep-0313.c.o'
../src/xeps/chatty-xep-0313.c: In function ‘cb_chatty_mam_msg_received’:
../src/xeps/chatty-xep-0313.c:706:13: warning: ‘user’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  706 |       dts = get_im_timestamp_for_uuid(stanza_id, user);
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

from a quick look they look valid