check if input param is valid

Change-Id: I1b3e25db613ec9b19d69bdb098773269a8cd1bab

diff --git a/src/tdm_display.c b/src/tdm_display.c
index 9da5d3a..76aec3d 100644 (file)
--- a/src/tdm_display.c
+++ b/src/tdm_display.c
@@ -502,11 +502,11 @@ EXTERN tdm_error
 tdm_output_get_subpixel(tdm_output *output, unsigned int *subpixel)
 {
     OUTPUT_FUNC_ENTRY();
+    TDM_RETURN_VAL_IF_FAIL(subpixel != NULL, TDM_ERROR_INVALID_PARAMETER);
 
     pthread_mutex_lock(&private_display->lock);
 
-    if (subpixel)
-        *subpixel = private_output->caps.subpixel;
+    *subpixel = private_output->caps.subpixel;
 
     pthread_mutex_unlock(&private_display->lock);