[PATCH] crypto/cnxk: fix condition check

[Anoob Joseph]

> Subject: [PATCH] crypto/cnxk: fix condition check
> 
> The value of ec_mdata cannot be NULL, instead check that value of
> private_data_offset was set.
> 
> 
> Fixes: c3a498c01121 ("crypto/cnxk: add event metadata set operation")
> Coverity issue: 378861 Coverity issue: 378865
> 
> Signed-off-by: Volodymyr Fialko <vfialko at marvell.com>

Acked-by: Anoob Joseph <anoobj at marvell.com>