[PATCH] compile warning

[Antonio Borneo]

I get a compile warning using my aged gcc 4.1.1
 main.c:332: warning: passing argument 1 of ‘free’ discards qualifiers
from pointer target type
The pointer passed to free() has been originally declared as "const",
but now this property has been dropped.

Patch in attachment fixes the declaration.

Best Regards,
Antonio Borneo
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