Avert some warnings

software/include/common_dvi_pin_configs.h

@@ -106,7 +106,7 @@ static const struct dvi_serialiser_cfg adafruit_dvibell_cfg = {
   .sm_tmds = {0, 1, 2},
   .pins_tmds = {10, 8, 6},
   .pins_clk = 12,
-  .invert_diffpairs = false
+  .invert_diffpairs = false,
 };
 
 #endif

src/PicoDVI.cpp

@@ -270,6 +270,7 @@ DVIGFX1::~DVIGFX1(void) {
 }
 
 static void mainloop1(struct dvi_inst *inst) {
+  (void)inst; // Avoid compiler warning
   ((DVIGFX1 *)gfxptr)->_mainloop();
 }
 
@@ -406,6 +407,7 @@ static void mainlooptext1(struct dvi_inst *inst) {
 // since nothing important to do in idle func above.
 
 static void __not_in_flash_func(mainlooptext1)(struct dvi_inst *inst) {
+  (void)inst; // Avoid compiler warning
   ((DVItext1 *)gfxptr)->_mainloop();
 }