--- a/drivers/usb/host/adm5120-dbg.c
+++ b/drivers/usb/host/adm5120-dbg.c
@@ -133,7 +133,7 @@ urb_print(struct admhcd *ahcd, struct ur
 
 #define admhc_dbg_sw(ahcd, next, size, format, arg...) \
 	do { \
-	if (next) { \
+	if (next != NULL) { \
 		unsigned s_len; \
 		s_len = scnprintf(*next, *size, format, ## arg ); \
 		*size -= s_len; *next += s_len; \