[OE-core] [PATCH] sstate.bbclass: Ensure we expand stamp-extra-info

[Richard Purdie]

Without this change we can end up looking for <stamp>.${MACHINE}
instead of the expected expanded value.

Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
diff --git a/meta/classes/sstate.bbclass b/meta/classes/sstate.bbclass
index a777c79..951caa3 100644
--- a/meta/classes/sstate.bbclass
+++ b/meta/classes/sstate.bbclass
@@ -259,7 +259,7 @@ def sstate_clean(ss, d):
             bb.utils.unlockfile(lock)
 
     stfile = d.getVar("STAMP", True) + ".do_" + ss['task']
-    extrainf = d.getVarFlag("do_" + ss['task'], 'stamp-extra-info')
+    extrainf = d.getVarFlag("do_" + ss['task'], 'stamp-extra-info', True)
     oe.path.remove(stfile)
     oe.path.remove(stfile + "_setscene")
     if extrainf: