Coding Standards: Remove redundant check in wp_read_image_metadata().

This logical branch is only reachable if `$exif_description` is already verified as truthy a few lines above.

Follow-up to [57267].

Props justlevine.
See #63268.

git-svn-id: https://develop.svn.wordpress.org/trunk@60475 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-admin/includes/image.php

@@ -967,7 +967,7 @@ function wp_read_image_metadata( $file ) {
 			}
 
 			// If both user comments and description are present.
-			if ( empty( $meta['caption'] ) && $exif_description && $exif_usercomment ) {
+			if ( empty( $meta['caption'] ) && $exif_usercomment ) {
 				if ( ! empty( $meta['title'] ) && $exif_description === $meta['title'] ) {
 					$caption = $exif_usercomment;
 				} else {