[rrd-developers] [patch] typo in error message; remove superfluous checks to free(NULL)

[Bernhard Fischer]

Hi,

1) cosmetic typo in error message
  faild should read failed
2) null ptr checks for the arg of free() are superfluous. See
  http://www.opengroup.org/onlinepubs/009695399/functions/free.html
  which mandates that it's perfectly valid to free(NULL);

Please apply.

TIA and cheers,
Bernhard
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