Fix misc 21 (#1573)

* Make `sNew` in (unused) `code_800FC620.c` a string

It is passed as a filename to `__osMallocDebug` so should be a nul-terminated string, not a char[3] missing an explicit \0

* Fix gcc warning in `JpegDecoder_ParseNextSymbol` about SLL on negative value

-1U is an unsigned value, aka 0xFFFFFFFF
I keep -1 because it seems that's what a jpeg standard has too

References:
https://stackoverflow.com/questions/40508958/shifting-a-negative-signed-value-is-undefined
https://www.w3.org/Graphics/JPEG/itu-t81.pdf (page 105, figure F.12)

* Small cleanup

* Fix few mistakes (thanks gcc warnings)

* Add `@bug` in file select settings draw code, using the wrong array

* format

* format main

* rename arg for a happy formatter

* Move important function call out of a printf

src/code/jpegdecoder.c

@@ -154,7 +154,7 @@ s32 JpegDecoder_ParseNextSymbol(JpegHuffmanTable* hTable, s16* outCoeff, s8* out
     if (sym) {
         *outCoeff = JpegDecoder_ReadBits(sym);
         if (*outCoeff < (1 << (sym - 1))) {
-            *outCoeff += (-1 << sym) + 1;
+            *outCoeff += (-1U << sym) + 1;
         }
     }