Revert "get_pkgname_from_originspec: Assert we do not already have a default FLAVOR originspec-pkgname"

This reverts commit 4e6daf5.

This function races with other callers.

Author: bdrewery

src/share/poudriere/common.sh

@@ -8059,10 +8059,7 @@ get_pkgname_from_originspec() {
 	*) return 1 ;;
 	esac
 	# Yup, this was the default FLAVOR
-	if ! noclobber shash_set originspec-pkgname "${_originspec_lookup}" \
-	    "${_pkgname}"; then
-		err 1 "Already had originspec-pkgname ${_originspec_lookup} set to ${_pkgname}"
-	fi
+	shash_set originspec-pkgname "${_originspec_lookup}" "${_pkgname}" || :
 	setvar "${var_return}" "${_pkgname}"
 }