avoid different struct type problem.

Index: ehci.c
===================================================================
RCS file: /cvsroot/src/sys/dev/usb/ehci.c,v
retrieving revision 1.321
diff -p -u -r1.321 ehci.c
--- ehci.c	5 Feb 2024 23:04:18 -0000	1.321
+++ ehci.c	6 Feb 2024 23:41:38 -0000
@@ -294,6 +294,7 @@ void			ehci_dump(void);
 Static void		ehci_dump_regs(ehci_softc_t *);
 Static void		ehci_dump_sqtds(ehci_soft_qtd_t *);
 Static void		ehci_dump_sqtd(ehci_soft_qtd_t *);
+Static void		ehci_dump_qh_qtd(struct ehci_qh_qtd_t *);
 Static void		ehci_dump_qtd(ehci_qtd_t *);
 Static void		ehci_dump_sqh(ehci_soft_qh_t *);
 Static void		ehci_dump_sitd(struct ehci_soft_itd *);
@@ -1755,6 +1756,24 @@ ehci_dump_sqtd(ehci_soft_qtd_t *sqtd)
 }
 
 Static void
+ehci_dump_qh_qtd(struct ehci_qh_qtd_t *qh_qtd)
+{
+	ehci_qtd_t qtd = {
+		.qtd_next = qh_qtd->qtd_next,
+		.qtd_altnext = qh_qtd->qtd_altnext,
+		.qtd_status = qh_qtd->qtd_status,
+	};
+
+	/* Manually memcpy(), because of volatile. */
+	for (unsigned i = 0; i < EHCI_QTD_NBUFFERS; i++) {
+		qtd.qtd_buffer[i] = qh_qtd->qtd_buffer[i];
+		qtd.qtd_buffer_hi[i] = qh_qtd->qtd_buffer_hi[i];
+	}
+
+	ehci_dump_qtd(&qtd);
+}
+
+Static void
 ehci_dump_qtd(ehci_qtd_t *qtd)
 {
 	EHCIHIST_FUNC();	EHCIHIST_CALLED();
@@ -1830,7 +1849,7 @@ ehci_dump_sqh(ehci_soft_qh_t *sqh)
 	link = le32toh(qh->qh_curqtd);
 	ehci_dump_link(link, false);
 	DPRINTFN(10, "Overlay qTD:", 0, 0, 0, 0);
-	ehci_dump_qtd(&qh->qh_qtd);
+	ehci_dump_qh_qtd(&qh->qh_qtd);
 
 	usb_syncmem(&sqh->dma, sqh->offs, sizeof(sqh->qh),
 	    BUS_DMASYNC_PREREAD);
Index: ehcireg.h
===================================================================
RCS file: /cvsroot/src/sys/dev/usb/ehcireg.h,v
retrieving revision 1.38
diff -p -u -r1.38 ehcireg.h
--- ehcireg.h	5 Feb 2024 23:07:42 -0000	1.38
+++ ehcireg.h	6 Feb 2024 23:41:38 -0000
@@ -394,7 +394,7 @@ typedef struct {
 	 * 32-byte aligned, so declare the fields instead of embedding
 	 * a ehci_qtd_t directly.
 	 */
-	struct {
+	struct ehci_qh_qtd_t {
 		volatile ehci_link_t	qtd_next;
 		volatile ehci_link_t	qtd_altnext;
 		volatile uint32_t	qtd_status;