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[libvirt] [PATCH] qemu: fix no error settings if fail to find a disk match path

When we use get blockjob info to a unexist disk path, we will
get a error like this:

 # virsh blockjob r7 vdc
 error: An error occurred, but the cause is unknown

This is because we do not set the error when jump to endjob.
As virDomainDiskByName won't set the error, we need set them
in the callers function.

Signed-off-by: Luyao Huang <lhuang redhat com>
 src/qemu/qemu_driver.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 900740e..f134248 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -16414,8 +16414,11 @@ qemuDomainGetBlockJobInfo(virDomainPtr dom,
     if (qemuDomainSupportsBlockJobs(vm, NULL) < 0)
         goto endjob;
-    if (!(disk = virDomainDiskByName(vm->def, path, true)))
+    if (!(disk = virDomainDiskByName(vm->def, path, true))) {
+        virReportError(VIR_ERR_INVALID_ARG,
+                       _("invalid path %s not assigned to domain"), path);
         goto endjob;
+    }
     qemuDomainObjEnterMonitor(driver, vm);
     ret = qemuMonitorGetBlockJobInfo(qemuDomainGetMonitor(vm),

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