[PATCH] Fixed two segmentation faults.

[PATCH] Fixed two segmentation faults.

Fixed two segmentations faults that could occur while processing an
invalid incoming DIMSE message due to insufficient error handling
causing a de-referenced NULL pointer.

Thanks to Nils Bars <nils.bars@rub.de> for the bug report and sample files.

This closes DCMTK issue #1114.

Gbp-Pq: Name 0004-Fixed-two-segmentation-faults.patch