memory leaks from msSHPOpen

[sgillies@…]

Valgrind shows memory leaking from msSHPOpen.

[sean@lenny python]$ valgrind --tool=memcheck
--suppressions=/home/sean/projects/valgrind-python.supp --num-callers=10
--leak-check=yes python tests/cases/maptest.py

...
==5709== 146 bytes in 2 blocks are definitely lost in loss record 56 of 84
==5709==    at 0x1B904A80: malloc (vg_replace_malloc.c:131)
==5709==    by 0x1C2EF8F7: msSHPOpen (mapshape.c:217)
==5709==    by 0x1C2F22BD: msSHPOpenFile (mapshape.c:1340)
==5709==    by 0x1C31AC73: msLayerOpen (maplayer.c:134)
==5709==    by 0x1C3237BB: msDrawVectorLayer (mapdraw.c:704)
==5709==    by 0x1C323595: msDrawLayer (mapdraw.c:626)
==5709==    by 0x1C322BC4: msDrawMap (mapdraw.c:321)
==5709==    by 0x1C2B702E: mapObj_draw (mapscript_wrap.c:1460)
==5709==    by 0x1C2D66D4: _wrap_mapObj_draw (mapscript_wrap.c:17246)
==5709==    by 0x80EA40C: PyCFunction_Call (in /usr/bin/python)
==5709==

[sgillies@…]

This leaks occurred because shpfile, psSHP, pszBasename, pszFullname were not
being freed before exiting from an error state.  Is fixed in 4.2 and the 
CVS HEAD.