Fix warning Function call argument is an uninitialized value

acr122_usb.c:237:3: warning: Function call argument is an uninitialized value
  LOG_HEX(NFC_LOG_GROUP_COM, "TX", abtTx, szTx);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../libnfc/log.h:107:7: note: expanded from macro 'LOG_HEX'
      snprintf (__acBuf + __szBuf, sizeof(__acBuf) - __szBuf, "%02x ",((uint8_t *)(pbtData))[__szPos]); \
      ^                                                               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Maybe a side effect of the #pragma pack not properly understood by the static analyser
but anyway acr122_usb_frame_template is also used the same way to initialize the other frames

libnfc/drivers/acr122_usb.c

@@ -782,15 +782,11 @@ acr122_usb_init(nfc_device *pnd)
     return res;
 
   // Power On ICC
-  struct ccid_header ccid_frame = {
-    .bMessageType = PC_to_RDR_IccPowerOn,
-    .dwLength = 0,
-    .bSlot = 0,
-    .bSeq = 0,
-    .bMessageSpecific = { 0x01, 0x00, 0x00 },
+  uint8_t ccid_frame[] = {
+    PC_to_RDR_IccPowerOn, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00
   };
 
-  if ((res = acr122_usb_bulk_write(DRIVER_DATA(pnd), (unsigned char *)&ccid_frame, sizeof(struct ccid_header), 1000)) < 0)
+  if ((res = acr122_usb_bulk_write(DRIVER_DATA(pnd), ccid_frame, sizeof(struct ccid_header), 1000)) < 0)
     return res;
   if ((res = acr122_usb_bulk_read(DRIVER_DATA(pnd), abtRxBuf, sizeof(abtRxBuf), 1000)) < 0)
     return res;