#7 cppcheck reports realloc mistakes in the code

[Paul Wise]

[flasm.c:187]: (error) Common realloc mistake: 'aStrings' nulled but not freed upon failure
[flasm.c:225]: (error) Common realloc mistake: 'labels' nulled but not freed upon failure
[flasm.c:254]: (error) Common realloc mistake: 'output' nulled but not freed upon failure
[unflasm.c:286]: (error) Common realloc mistake: 'labels' nulled but not freed upon failure
[unflasm.c:336]: (error) Common realloc mistake: 'flasmDict' nulled but not freed upon failure