Fix some variant type comparisons

src/sound/snd_adlibgold.c

@@ -842,7 +842,6 @@ static void
 adgold_input_msg(void *p, uint8_t *msg, uint32_t len)
 {
     adgold_t *adgold = (adgold_t *) p;
-    uint8_t   i;
 
     if (adgold->sysex)
         return;
@@ -850,7 +849,7 @@ adgold_input_msg(void *p, uint8_t *msg, uint32_t len)
     if (adgold->uart_in) {
         adgold->adgold_mma_status |= 0x04;
 
-        for (i = 0; i < len; i++) {
+        for (uint32_t i = 0; i < len; i++) {
             adgold->midi_queue[adgold->midi_w++] = msg[i];
             adgold->midi_w &= 0x0f;
         }

src/sound/snd_audiopci.c

@@ -1969,9 +1969,8 @@ static void
 es1371_input_msg(void *p, uint8_t *msg, uint32_t len)
 {
     es1371_t *dev = (es1371_t *) p;
-    uint8_t   i;
 
-    for (i = 0; i < len; i++)
+    for (uint32_t i = 0; i < len; i++)
         es1371_write_fifo(dev, msg[i]);
 }
 

src/sound/snd_gus.c

@@ -1085,7 +1085,6 @@ static void
 gus_input_msg(void *p, uint8_t *msg, uint32_t len)
 {
     gus_t  *gus = (gus_t *) p;
-    uint8_t i;
 
     if (gus->sysex)
         return;
@@ -1093,7 +1092,7 @@ gus_input_msg(void *p, uint8_t *msg, uint32_t len)
     if (gus->uart_in) {
         gus->midi_status |= MIDI_INT_RECEIVE;
 
-        for (i = 0; i < len; i++) {
+        for (uint32_t i = 0; i < len; i++) {
             gus->midi_queue[gus->midi_w++] = msg[i];
             gus->midi_w &= 63;
         }

src/sound/snd_sb_dsp.c

@@ -1055,7 +1055,6 @@ void
 sb_dsp_input_msg(void *p, uint8_t *msg, uint32_t len)
 {
     sb_dsp_t *dsp = (sb_dsp_t *) p;
-    uint8_t   i   = 0;
 
     sb_dsp_log("MIDI in sysex = %d, uart irq = %d, msg = %d\n", dsp->midi_in_sysex, dsp->uart_irq, len);
 
@@ -1068,11 +1067,11 @@ sb_dsp_input_msg(void *p, uint8_t *msg, uint32_t len)
         return;
 
     if (dsp->uart_irq) {
-        for (i = 0; i < len; i++)
+        for (uint32_t i = 0; i < len; i++)
             sb_add_data(dsp, msg[i]);
         sb_irq(dsp, 1);
     } else if (dsp->midi_in_poll) {
-        for (i = 0; i < len; i++)
+        for (uint32_t i = 0; i < len; i++)
             sb_add_data(dsp, msg[i]);
     }
 }