util: Report system error when virThreadCreateFull fails

Otherwise 'Unknown' error will be returned to client.
Signed-off-by: NErik Skultety <eskultet@redhat.com>

po/POTFILES.in

@@ -235,6 +235,7 @@ src/util/virstoragefile.c
 src/util/virstring.c
 src/util/virsysinfo.c
 src/util/virthreadjob.c
+src/util/virthreadpool.c
 src/util/virtime.c
 src/util/virtpm.c
 src/util/virtypedparam.c

src/util/virthreadpool.c

@@ -183,6 +183,7 @@ virThreadPoolExpand(virThreadPoolPtr pool, size_t gain, bool priority)
                                 true,
                                 data) < 0) {
             VIR_FREE(data);
+            virReportSystemError(errno, "%s", _("Failed to create thread"));
             goto error;
         }
     }