osmo-release.sh: Remove temporary file TODO-RELEASE.entries after use

Change-Id: I1cac39093d43910c2f5b969f5287cf3678110f4e
diff --git a/osmo-release.sh b/osmo-release.sh
index ed40d0b..fbaf63d 100755
--- a/osmo-release.sh
+++ b/osmo-release.sh
@@ -42,6 +42,7 @@
 		fi
 	fi
 	xargs -a TODO-RELEASE.entries -r -d'\n' -I entry dch -m -v $NEW_VER "entry"
+	rm TODO-RELEASE.entries
 fi
 dch -r -m --distribution "unstable" ""
 git add -u