refactor: more clint (#20910)

src/nvim/mbyte.c

@@ -1550,7 +1550,7 @@ void show_utf8(void)
       }
       clen = utf_ptr2len((char *)line + i);
     }
-    sprintf((char *)IObuff + rlen, "%02x ",
+    sprintf((char *)IObuff + rlen, "%02x ",  // NOLINT(runtime/printf)
             (line[i] == NL) ? NUL : line[i]);          // NUL is stored as NL
     clen--;
     rlen += (int)strlen(IObuff + rlen);