How to remove img sizes in Wordpress rss?

Question

RSS

The RSS validator complains about setting image sizes in RSS.
Tell me who can, how can they be removed from the RSS feed.
I display Thumbnail using the function

function mayak_image_rss($content) { 
global $post;
if ( has_post_thumbnail( $post->ID ) ) { 
$content = '' . get_the_post_thumbnail( $post->ID, 'full', array( 'style' => 'float:left; margin:0 10px 10px 0;' ) ) . '' . $content; 
}
return $content; 
} 
add_filter('the_excerpt_rss', 'mayak_image_rss');