[U-Boot] build: Fix make errors generated when building 'distclean'

[Tom Rini]

On Wed, Mar 27, 2013 at 02:34:18PM -0000, Vadim Bendebury wrote:

> It was noticed that when `make distclean' is run, the make process
> terminates with error reporting something like:
> 
> rm: cannot remove '/tmp/foobar/': Is a directory
> make: *** [clobber] Error 1
> 
> The problem is that the list of files targeted for removal includes a
> directory in case CONFIG_SPL_TARGET is not set.
> 
> The fix has been tested as follows:
> 
>  Ran several times the following sequence of commands:
> 
>      CROSS_COMPILE=/usr/bin/arm-linux-gnueabi- make O=/tmp/foobar smdk5250_config
>      CROSS_COMPILE=/usr/bin/arm-linux-gnueabi- make O=/tmp/foobar distclean
> 
>  it did not cause an error, it used to before this change.
> 
> Signed-off-by: Vadim Bendebury <vbendeb at chromium.org>
> Acked-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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