Replace direct comparisons to NULL i.e.
'x == NULL' with '!x'. As per coding standard.
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NRavikant B Sharma <ravikant.s2@samsung.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>