--- 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; \
