Redundant NULL checks before free()

[pavlinux]

Redundant NULL checks before free()

ANSI-C Standard:

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The ANSI standard ANSI X3.159-1989 "Programming Language C."
specifies that free(NULL) is a no op.

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"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".

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2. Kernighan and D. Ritchie, "Programming Language C",

Second edition. ISBN 5-8459-0891-4
Chapter 8.7 "Example - Memory Allocator", page 197, 2 line from the bottom :)

"... if the pointer is NULL, creates releases list of free blocks.
It contains one block of size zero, and points back to itself "

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[pavlinux]

redundant checks