[PATCH v2] tools/mxsimage: Remove fclose on empty FILE pointer

[sbabic at denx.de]

> If `sb_load_cmdfile()` fails to open the configuration file it will jump
> to error handling where the code will try to `fclose()` the FILE pointer
> which is NULL causing `mkimage` to segfault.
> This patch removes the label for error handling and instead returns
> immediately which skips the `fclose()` and prevents the segfault. The
> errno is also described in the error message to guide users.
> Signed-off-by: Mattias Hansson <hansson.mattias at gmail.com>
> Reviewed-by: Wolfgang Denk <wd at denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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