[U-Boot] cmd: mtd: fix compilation warning for help when SYS_LONGHELP=n

[Tom Rini]

On Thu, Jan 17, 2019 at 10:18:47AM +0100, Quentin Schulz wrote:

> cmd/mtd.c:447:13: warning: ‘mtd_help_text’ defined but not used [-Wunused-variable]
> static char mtd_help_text[] =
>             ^~~~~~~~~~~~~
> 
> When SYS_LONGHELP is not defined. After looking at how other commands
> work, we should surround the whole help text (even its declaration) with
> an #ifdef CONFIG_SYS_LONGHELP, since it's compiled out when calling
> _CMD_HELP[1] on the help text variable argument to U_BOOT_CMD.
> 
> [1] https://elixir.bootlin.com/u-boot/latest/source/include/command.h#L181
> 
> Signed-off-by: Quentin Schulz <quentin.schulz at bootlin.com>
> Reviewed-by: Miquel Raynal <miquel.raynal at bootlin.com>

Applied to u-boot/master, thanks!

-- 
Tom
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