qemu: Remove unecessary error keeping in qemuDomainBlockCopyCommon

Since 3decae00 qemuDomainStorageSourceAccessRevoke keeps the libvirt
error which was set prior to the call around even after the call, thus
we don't need to do the same when reverting access in the block copy
code.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_driver.c

@@ -17583,7 +17583,6 @@ qemuDomainBlockCopyCommon(virDomainObjPtr vm,
     bool need_unlink = false;
     VIR_AUTOUNREF(virQEMUDriverConfigPtr) cfg = virQEMUDriverGetConfig(driver);
     const char *format = NULL;
-    virErrorPtr monitor_error = NULL;
     bool reuse = !!(flags & VIR_DOMAIN_BLOCK_COPY_REUSE_EXT);
     qemuBlockJobDataPtr job = NULL;
     VIR_AUTOUNREF(virStorageSourcePtr) mirror = mirrorsrc;
@@ -17747,7 +17746,6 @@ qemuDomainBlockCopyCommon(virDomainObjPtr vm,
     if (qemuDomainObjExitMonitor(driver, vm) < 0)
         ret = -1;
     if (ret < 0) {
-        monitor_error = virSaveLastError();
         qemuDomainStorageSourceAccessRevoke(driver, vm, mirror);
         goto endjob;
     }
@@ -17768,10 +17766,6 @@ qemuDomainBlockCopyCommon(virDomainObjPtr vm,
         VIR_WARN("%s", _("unable to remove just-created copy target"));
     virStorageFileDeinit(mirror);
     qemuDomainObjEndJob(driver, vm);
-    if (monitor_error) {
-        virSetError(monitor_error);
-        virFreeError(monitor_error);
-    }
     qemuBlockJobStartupFinalize(job);
 
     return ret;