pciconf(8): Fix the -x option and its documentation

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D50421

usr.sbin/pciconf/pciconf.8

@@ -23,7 +23,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd June 14, 2018
+.Dd May 19, 2025
 .Dt PCICONF 8
 .Os
 .Sh NAME
@@ -39,7 +39,7 @@
 .Nm
 .Fl w Oo Fl b | h Oc Ar device addr value
 .Nm
-.Fl D Oo Fl b | h | x Oc Ar device addr Op start Ns Op : Ns Ar count
+.Fl D Oo Fl b | h | x Oc Ar device bar Op Ar start Op Ns Ar count
 .Sh DESCRIPTION
 The
 .Nm

usr.sbin/pciconf/pciconf.c

@@ -110,7 +110,7 @@ main(int argc, char **argv)
 	bars = bridge = caps = errors = verbose = vpd= 0;
 	width = 4;
 
-	while ((c = getopt(argc, argv, "aBbcDehlrwVv")) != -1) {
+	while ((c = getopt(argc, argv, "aBbcDehlrwVvx")) != -1) {
 		switch(c) {
 		case 'a':
 			attachedmode = 1;