Conflict var name in _get_meta_sql

[Rahe]

Hi,

One of the parameters is overriden in this function ( $meta_type ) and is returned in the filter.

function _get_meta_sql( $meta_query, $meta_type, $primary_table, $primary_id_column, $context = null ) {

and overriden here :

		$meta_type = isset( $q['type'] ) ? strtoupper( $q['type'] ) : 'CHAR';

This bug is blocker when you use the filter :

	return apply_filters_ref_array( 'get_meta_sql', array( compact( 'join', 'where' ), $meta_query, $meta_type, $primary_table, $primary_id_column, &$context ) );

[Rahe]

Speedy fix

[automattor]

(In [17530]) Avoid var name conflict in _get_meta_sql(). Fixes type var passed to get_meta_sql filter. Props Rahe, nacin. fixes #16825 for trunk

[ryan]

(In [17531]) Avoid var name conflict in _get_meta_sql(). Fixes type var passed to get_meta_sql filter. Props Rahe, nacin. fixes #16825 for 3.1