package.bbclass: Ensure debug source file is generated correctly

The command for generating debug sources appends to the file, therefore we need
to ensure it does not exist before we run the command else we end up doing
more work that we should have to.

(From OE-Core rev: 48dfd61901ce07491ef913cf04dbd9de9a52759f)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/package.bbclass

@@ -242,6 +242,8 @@ def splitdebuginfo(file, debugfile, debugsrcdir, d):
     workparentdir = d.getVar("DEBUGSRC_OVERRIDE_PATH", True) or os.path.dirname(os.path.dirname(workdir))
     sourcefile = d.expand("${WORKDIR}/debugsources.list")
 
+    bb.utils.remove(sourcefile)
+
     # We ignore kernel modules, we don't generate debug info files.
     if file.find("/lib/modules/") != -1 and file.endswith(".ko"):
         return 1