hw/usb: Fix memory leak in musb_reset()

The musb_reset function was causing a memory leak by not properly freeing
the memory associated with USBPacket instances before reinitializing them.
This commit addresses the memory leak by adding calls to usb_packet_cleanup
for each USBPacket instance before reinitializing them with usb_packet_init.

Asan log:

=2970623==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 256 byte(s) in 16 object(s) allocated from:
    #0 0x561e20629c3d in malloc llvm/compiler-rt/lib/asan/asan_malloc_linux.cpp:129:3
    #1 0x7fee91885738 in g_malloc (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x5e738)
    #2 0x561e21b4d0e1 in usb_packet_init hw/usb/core.c:531:5
    #3 0x561e21c5016b in musb_reset hw/usb/hcd-musb.c:372:9
    #4 0x561e21c502a9 in musb_init hw/usb/hcd-musb.c:385:5
    #5 0x561e21c893ef in tusb6010_realize hw/usb/tusb6010.c:827:15
    #6 0x561e23443355 in device_set_realized hw/core/qdev.c:510:13
    #7 0x561e2346ac1b in property_set_bool qom/object.c:2354:5
    #8 0x561e23463895 in object_property_set qom/object.c:1463:5
    #9 0x561e23477909 in object_property_set_qobject qom/qom-qobject.c:28:10
    #10 0x561e234645ed in object_property_set_bool qom/object.c:1533:15
    #11 0x561e2343c830 in qdev_realize hw/core/qdev.c:291:12
    #12 0x561e2343c874 in qdev_realize_and_unref hw/core/qdev.c:298:11
    #13 0x561e20ad5091 in sysbus_realize_and_unref hw/core/sysbus.c:261:12
    #14 0x561e22553283 in n8x0_usb_setup hw/arm/nseries.c:800:5
    #15 0x561e2254e99b in n8x0_init hw/arm/nseries.c:1356:5
    #16 0x561e22561170 in n810_init hw/arm/nseries.c:1418:5

Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
Reviewed-by: Xingtao Yao <yaoxt.fnst@fujitsu.com>
Message-Id: <20240630163225.2973081-1-zheyuma97@gmail.com>

Author: ZheyuMa

hw/usb/hcd-musb.c

@@ -368,6 +368,8 @@ void musb_reset(MUSBState *s)
         s->ep[i].maxp[1] = 0x40;
         s->ep[i].musb = s;
         s->ep[i].epnum = i;
+        usb_packet_cleanup(&s->ep[i].packey[0].p);
+        usb_packet_cleanup(&s->ep[i].packey[1].p);
         usb_packet_init(&s->ep[i].packey[0].p);
         usb_packet_init(&s->ep[i].packey[1].p);
     }