tools: Remove redundant NULL checks before free() (found by Smatch).

[Michael Stefaniuc]

Robert Shearman wrote:
> 
> I think the checks are necessary to be compatible with libc's on other
> platforms.
No they aren't. free() doing nothing with NULL pointers is ANSI-C standard:
"free deallocates the space pointed to by p: it does nothing if p is NULL."
Quoted from "The C Programming Language" second edition by Kernighan and
Ritchie with the subtitle "ANSI C".

bye
	michael
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