Get rid of implicit uint conversions

Author: atoktoto

src/class/midi/midi_host.c

@@ -100,7 +100,7 @@ typedef struct
 #define MAX_OUT_JACKS 8
   struct {
     uint8_t jack_id;
-    int8_t jack_type;
+    uint8_t jack_type;
     uint8_t string_index;
   } in_jack_info[MAX_IN_JACKS];
   uint8_t next_in_jack;

src/portable/raspberrypi/rp2040/hcd_rp2040.c

@@ -149,7 +149,7 @@ static void __tusb_irq_path_func(hw_handle_buff_status)(void)
         // IEP3 IN  is bit 6
         // IEP3 OUT is bit 7
         // etc
-        for(int j = 0; j < 2; j++){
+        for(uint j = 0; j < 2; j++){
             bit = 1 << (i*2+j);
             if (remaining_buffers & bit)
             {