[U-Boot] log: Correct missing free() on error in log_add_filter()

[Tom Rini]

On Mon, Apr 02, 2018 at 02:42:39AM -0600, Simon Glass wrote:

> If there is a problem with the parameters to log_add_filter(), the memory
> allocated is currently not freed. Fix this.
> 
> Reported-by: Coverity (CID: 171962)
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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