Mms: Only save one long massage to phone when SIM card is full

It would save more than one same long messages to phone storage when
SIM card is full, because the break of the loop is missing.

To fix it, add the break after saving one instance in phone storage.

CRs-Fixed: 652180

Change-Id: If4018f043bdf7edddbd1369994e630f85957e7cd