Media: Use strict comparison in make_subsize().

Follow up from [55278].

Props bueltge, desrosj, mukesh27.
See #57370.


git-svn-id: https://develop.svn.wordpress.org/trunk@55300 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-image-editor-imagick.php

@@ -503,7 +503,7 @@ public function make_subsize( $size_data ) {
 			$size_data['crop'] = false;
 		}
 
-		if ( ( $this->size['width'] == $size_data['width'] ) && ( $this->size['height'] == $size_data['height'] ) ) {
+		if ( ( $this->size['width'] === $size_data['width'] ) && ( $this->size['height'] === $size_data['height'] ) ) {
 			return new WP_Error( 'image_subsize_create_error', __( 'The image already has the requested size.' ) );
 		}