Gallery2: Fix crash of gallery on showing details

The exif parser adds a terminating zero for string values. This increases the
byte count for that entry beyond the set byte count. Causing a null value
in e.g. the "Model" field for images taken with e.g. a Samsung Wave 2.

Change-Id: Ib781d9262dbffb610686c939dad94a6cf4c17727
1 file changed