Hob: Clear the building status if command failed

We may meet certain command failure during build time, for example,
out of memory. In this case, we need to clear the "building" status.

This fixes [YOCTO #2371]

(Bitbake rev: 283dbbbf5d34adb4c9e3aa87e3925fdebe21ff42)

Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/ui/crumbs/hobeventhandler.py

@@ -199,6 +199,8 @@ class HobHandler(gobject.GObject):
             self.clear_busy()
             self.emit("command-failed", self.error_msg)
             self.error_msg = ""
+            if self.building:
+                self.building = False
         elif isinstance(event, (bb.event.ParseStarted,
                  bb.event.CacheLoadStarted,
                  bb.event.TreeDataPreparationStarted,