maint: drop spurious semicolons

Detected with:
git grep ';;$' -- '**/*.[ch]'

* src/network/bridge_driver.c (networkRadvdConfContents): Fix
harmless typo.
* src/phyp/phyp_driver.c (phypUUIDTable_Pull): Likewise.
* src/qemu/qemu_monitor_json.c (qemuMonitorJSONDriveDel):
Likewise.

src/network/bridge_driver.c

@@ -981,7 +981,7 @@ networkRestartDhcpDaemon(virNetworkObjPtr network)
 static int
 networkRadvdConfContents(virNetworkObjPtr network, char **configstr)
 {
-    virBuffer configbuf = VIR_BUFFER_INITIALIZER;;
+    virBuffer configbuf = VIR_BUFFER_INITIALIZER;
     int ret = -1, ii;
     virNetworkIpDefPtr ipdef;
     bool v6present = false;

src/phyp/phyp_driver.c

@@ -736,7 +736,7 @@ phypUUIDTable_Pull(virConnectPtr conn)
         if (!channel) {
             if (libssh2_session_last_errno(session) !=
                 LIBSSH2_ERROR_EAGAIN) {
-                goto err;;
+                goto err;
             } else {
                 waitsocket(sock, session);
             }

src/qemu/qemu_monitor_json.c

@@ -3068,7 +3068,7 @@ int qemuMonitorJSONDriveDel(qemuMonitorPtr mon,
                           _("deleting disk is not supported.  "
                             "This may leak data if disk is reassigned"));
                 ret = 1;
-                virResetLastError();;
+                virResetLastError();
             }
         }
     } else if (qemuMonitorJSONHasError(reply, "DeviceNotFound")) {