nuttx: fix multiple 'FAR', 'CODE' and style issues

Signed-off-by: Petro Karashchenko <petro.karashchenko@gmail.com>

libs/libc/locale/lib_iconv.c

@@ -860,7 +860,7 @@ size_t iconv(iconv_t cd, FAR char **in, FAR size_t *inb,
                   goto starved;
                 }
 
-              d = *((unsigned char *)*in + 1);
+              d = *((FAR unsigned char *)*in + 1);
               if (d < 0xa1 && type == GB2312)
                 {
                   goto ilseq;