Post meta escaped incorrectly

[DD32]

As raised by Rick Beckman on wp-hackers, " and ' are double escaped upon adding post meta.

wpdb::escape() is being called on the metadata twice. See the attached patch

[KingdomGeek]

Thanks for getting this added so quickly, DD32!

I applied this patch to my 2.6.2 installation, and it works perfectly.

[azaozz]

(In [9116]) Fix escaping of post meta, props DD32, fixes #7768