clients/keyboard: free input_panel_surface

Fixes ASan leak:

Direct leak of 80 byte(s) in 1 object(s) allocated from:
    #0 0x7fe7791f4518 in calloc (/lib/x86_64-linux-gnu/libasan.so.5+0xe9518)
    #1 0x7fe779100892 in zalloc ../../git/wayland/src/wayland-private.h:232
    #2 0x7fe779100892 in proxy_create ../../git/wayland/src/wayland-client.c:422
    #3 0x7fe779100ede in create_outgoing_proxy ../../git/wayland/src/wayland-client.c:651
    #4 0x7fe779100ede in wl_proxy_marshal_array_constructor_versioned ../../git/wayland/src/wayland-client.c:736
    #5 0x7fe779101226 in wl_proxy_marshal_constructor ../../git/wayland/src/wayland-client.c:834
    #6 0x56428c9bc578 in zwp_input_panel_v1_get_input_panel_surface protocol/input-method-unstable-v1-client-protocol.h:678
    #7 0x56428c9c0bbb in set_toplevel ../../git/weston/clients/keyboard.c:965
    #8 0x56428c9c0c8d in display_output_handler ../../git/weston/clients/keyboard.c:980
    #9 0x56428c9ddead in display_handle_mode ../../git/weston/clients/window.c:5700
    #10 0x7fe7786668ed in ffi_call_unix64 (/lib/x86_64-linux-gnu/libffi.so.6+0x68ed)
    #11 0x7fe7786662be in ffi_call (/lib/x86_64-linux-gnu/libffi.so.6+0x62be)
    #12 0x7fe779103fac in wl_closure_invoke ../../git/wayland/src/connection.c:1018
    #13 0x7fe779100a48 in dispatch_event ../../git/wayland/src/wayland-client.c:1452
    #14 0x7fe779101e43 in dispatch_queue ../../git/wayland/src/wayland-client.c:1598
    #15 0x7fe779101e43 in wl_display_dispatch_queue_pending ../../git/wayland/src/wayland-client.c:1840
    #16 0x56428c9e031c in handle_display_data ../../git/weston/clients/window.c:6211
    #17 0x56428c9e2147 in display_run ../../git/weston/clients/window.c:6553
    #18 0x56428c9c1559 in main ../../git/weston/clients/keyboard.c:1053
    #19 0x7fe77885e09a in __libc_start_main ../csu/libc-start.c:308
    #20 0x56428c9bc029 in _start (/home/pq/build/weston-meson/clients/weston-keyboard+0x19029)

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

clients/keyboard.c

@@ -60,6 +60,7 @@ struct virtual_keyboard {
 	uint32_t surrounding_cursor;
 	struct keyboard *keyboard;
 	bool toplevel;
+	struct zwp_input_panel_surface_v1 *ips;
 };
 
 enum key_type {
@@ -969,6 +970,7 @@ set_toplevel(struct output *output, struct virtual_keyboard *virtual_keyboard)
 						ZWP_INPUT_PANEL_SURFACE_V1_POSITION_CENTER_BOTTOM);
 
 	virtual_keyboard->toplevel = true;
+	virtual_keyboard->ips = ips;
 }
 
 static void
@@ -1014,6 +1016,9 @@ keyboard_create(struct virtual_keyboard *virtual_keyboard)
 static void
 keyboard_destroy(struct virtual_keyboard *virtual_keyboard)
 {
+	if (virtual_keyboard->ips)
+		zwp_input_panel_surface_v1_destroy(virtual_keyboard->ips);
+
 	if (virtual_keyboard->input_panel)
 		zwp_input_panel_v1_destroy(virtual_keyboard->input_panel);