devtools: add script to fix unnecessary null checks

This script is based on the idea of the nullfree script
in the Linux kernel. It finds cases where a check for null
pointer is done, but is unneces

devtools: add script to fix unnecessary null checks

This script is based on the idea of the nullfree script
in the Linux kernel. It finds cases where a check for null
pointer is done, but is unnecessary because the function
already handles NULL pointer.

Basic example:
if (x->buf)
rte_free(x->buf);
can be reduced to:
rte_free(x->buf);

Signed-off-by: Stephen Hemminger <[email protected]>

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