Don't protect xkb_*_unref from NULL

Since xkbcommon-0.3.0, which is required by weston, a NULL argument
doesn't do anything.

Signed-off-by: Ran Benita <ran234@gmail.com>

src/compositor-wayland.c

@@ -1464,7 +1464,6 @@ input_handle_keymap(void *data, struct wl_keyboard *keyboard, uint32_t format,
 	else
 		weston_seat_init_keyboard(&input->base, keymap);
 
-	if (keymap)
 	xkb_keymap_unref(keymap);
 
 	return;

src/compositor-x11.c

@@ -322,7 +322,6 @@ x11_input_create(struct x11_compositor *c, int no_input)
 	keymap = x11_compositor_get_keymap(c);
 	if (weston_seat_init_keyboard(&c->core_seat, keymap) < 0)
 		return -1;
-	if (keymap)
 	xkb_keymap_unref(keymap);
 
 	x11_compositor_setup_xkb(c);

src/input.c

@@ -544,11 +544,9 @@ weston_keyboard_destroy(struct weston_keyboard *keyboard)
 
 #ifdef ENABLE_XKBCOMMON
 	if (keyboard->seat->compositor->use_xkbcommon) {
-		if (keyboard->xkb_state.state != NULL)
 		xkb_state_unref(keyboard->xkb_state.state);
 		if (keyboard->xkb_info)
 			weston_xkb_info_destroy(keyboard->xkb_info);
-		if (keyboard->pending_keymap)
 		xkb_keymap_unref(keyboard->pending_keymap);
 	}
 #endif
@@ -1869,7 +1867,6 @@ weston_xkb_info_destroy(struct weston_xkb_info *xkb_info)
 	if (--xkb_info->ref_count > 0)
 		return;
 
-	if (xkb_info->keymap)
 	xkb_keymap_unref(xkb_info->keymap);
 
 	if (xkb_info->keymap_area)

src/screen-share.c

@@ -214,7 +214,6 @@ ss_seat_handle_keymap(void *data, struct wl_keyboard *keyboard,
 	else
 		weston_seat_init_keyboard(&seat->base, keymap);
 
-	if (keymap)
 	xkb_keymap_unref(keymap);
 
 	return;