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 <[e-mail]>
Reviewed-by: Harry Wentland <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 	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->time);
+		kfree(core_stats->events);
 		kfree(core_stats);
 	}
 }