drm/amd/display: remove redundant null pointer check before kfree

kfree has taken the null pointer into account. hence it is safe
to remove the redundant null pointer check before kfree.
Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/modules/stats/stats.c

@@ -186,12 +186,8 @@ void mod_stats_destroy(struct mod_stats *mod_stats)
 	if (mod_stats != NULL) {
 		struct core_stats *core_stats = MOD_STATS_TO_CORE(mod_stats);
 
-		if (core_stats->time != NULL)
 		kfree(core_stats->time);
-
-		if (core_stats->events != NULL)
 		kfree(core_stats->events);
-
 		kfree(core_stats);
 	}
 }