[PATCH V2 18/30] imx: hab: Fix coverity issue in HAB event decoding

[sbabic at denx.de]

> From: Ye Li <ye.li at nxp.com>
> Fix below coverity issues caused by get_idx function where "-1" is
> compared with uint8_t "element"
> 343336 Unsigned compared with neg
> 343337 Operands don't affect result
> Additional, this function returns "-1" will cause overflow to
> event string array.
> Reviewed-by: Peng Fan <peng.fan at nxp.com>
> Signed-off-by: Ye Li <ye.li at nxp.com>
> Signed-off-by: Peng Fan <peng.fan at nxp.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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