While `WP_Filesystem_Base::size()` is documented to return `false` on failure, `ftp_size()` returns -1, and the method documentation was recently updated to reflect that.
This commit restores the previous `@return` tag and corrects the actual return value instead, to bring consistency with all the other `WP_Filesystem_*::size()` methods:
* `WP_Filesystem_Base::size()`
* `WP_Filesystem_Direct::size()`
* `WP_Filesystem_ftpsockets::size()`
* `WP_Filesystem_SSH2::size()`
{{{
@return int|false Size of the file in bytes on success, false on failure.
}}}
This better matches the purpose of the API to provide a consistent interface for various filesystem implementations.
Follow-up to [6779], [30678], [45226], [53860], [53862].
Fixes#51170.
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git-svn-id: http://core.svn.wordpress.org/trunk@53457 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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