qemu: domain: Mention searched disk in error of qemuDomainDiskByName

Mention the argument used if the disk can't be located.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

src/qemu/qemu_domain.c

@@ -12490,8 +12490,8 @@ qemuDomainDiskByName(virDomainDefPtr def,
     virDomainDiskDefPtr ret;
 
     if (!(ret = virDomainDiskByName(def, name, true))) {
-        virReportError(VIR_ERR_INVALID_ARG, "%s",
-                       _("No device found for specified path"));
+        virReportError(VIR_ERR_INVALID_ARG,
+                       _("disk '%s' not found in domain"), name);
         return NULL;
     }