Media: Pass the appropriate reference into wp_getimagesize.

With changes that were introduced in [49889] the second parameter for getimagesize() function is expecting a a reference.

Previously, most calls did not pass the 2nd param, and as a result, we are getting unexpected results.

This was only a problem with applications that are using a custom stream wrapper, and the image contained EXIF data.

For more see:

* https://github.com/humanmade/S3-Uploads/issues/496
* https://github.com/aws/aws-sdk-php/issues/1923

Fixes #52826.
Props terriann, SergeyBiryukov, Mista-Flo, hellofromTonya, rinatkhaziev, whyisjake.



git-svn-id: https://develop.svn.wordpress.org/trunk@50552 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/image.php

@@ -711,6 +711,7 @@ function wp_read_image_metadata( $file ) {
 	);
 
 	$iptc = array();
+	$info = array();
 	/*
 	 * Read IPTC first, since it might contain data not available in exif such
 	 * as caption, description etc.