Fix a few potential memory leaks
Some of the long filenames handling added in DOSFS-0_79 (DOSFSops.c revision 4.10) introduced extra points to return in the face of error, but didn't free memory allocated earlier in the function. Add missing free()'s. From a tip off from Dominic Plunkett in http://www.riscosopen.org/forum/forums/4/topics/3990#posts-51013 Version 1.09. Tagged as 'DOSFS-1_09'
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