Fix debug printing negative values

src/mini_printf.c

@@ -143,7 +143,7 @@ static s32 mini_strlen(const char *s)
     return len;
 }
 
-static s32 mini_itoa(u32 value, u32 radix, s32 uppercase, bool32 unsig, char *buffer)
+static s32 mini_itoa(s32 value, u32 radix, s32 uppercase, bool32 unsig, char *buffer)
 {
     char *pbuffer = buffer;
     s32 negative = 0;