hw/usb/hcd-ohci: Use definition to avoid dynamic stack allocation

The compiler isn't clever enough to figure 'width' is a constant,
so help it by using a definitions instead.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20220819153931.3147384-10-peter.maydell@linaro.org

hw/usb/hcd-ohci.c

@@ -805,13 +805,14 @@ static int ohci_service_iso_td(OHCIState *ohci, struct ohci_ed *ed)
     return 1;
 }
 
+#define HEX_CHAR_PER_LINE 16
+
 static void ohci_td_pkt(const char *msg, const uint8_t *buf, size_t len)
 {
     bool print16;
     bool printall;
-    const int width = 16;
     int i;
-    char tmp[3 * width + 1];
+    char tmp[3 * HEX_CHAR_PER_LINE + 1];
     char *p = tmp;
 
     print16 = !!trace_event_get_state_backends(TRACE_USB_OHCI_TD_PKT_SHORT);
@@ -822,7 +823,7 @@ static void ohci_td_pkt(const char *msg, const uint8_t *buf, size_t len)
     }
 
     for (i = 0; ; i++) {
-        if (i && (!(i % width) || (i == len))) {
+        if (i && (!(i % HEX_CHAR_PER_LINE) || (i == len))) {
             if (!printall) {
                 trace_usb_ohci_td_pkt_short(msg, tmp);
                 break;