render/drm_format_set: remove special LINEAR case

This was used to make the intersection of INVALID and LINEAR result
in LINEAR. We can now just require LINEAR to be in both lists.

render/drm_format_set.c

@@ -144,18 +144,6 @@ struct wlr_drm_format *wlr_drm_format_intersect(
 		const struct wlr_drm_format *a, const struct wlr_drm_format *b) {
 	assert(a->format == b->format);
 
-	// Special case: if a format only supports LINEAR and the other supports
-	// implicit modifiers, force LINEAR. This will force the allocator to
-	// create a buffer with a linear layout instead of an implicit modifier.
-	if (a->len == 1 && a->modifiers[0] == DRM_FORMAT_MOD_LINEAR &&
-			wlr_drm_format_has(b, DRM_FORMAT_MOD_INVALID)) {
-		return wlr_drm_format_dup(a);
-	}
-	if (b->len == 1 && b->modifiers[0] == DRM_FORMAT_MOD_LINEAR &&
-			wlr_drm_format_has(a, DRM_FORMAT_MOD_INVALID)) {
-		return wlr_drm_format_dup(b);
-	}
-
 	size_t format_cap = a->len < b->len ? a->len : b->len;
 	size_t format_size = sizeof(struct wlr_drm_format) +
 		format_cap * sizeof(a->modifiers[0]);