ignore result if jail was not built from source

as there is nothing to clean

Author: dch

src/share/poudriere/image.sh

@@ -402,7 +402,7 @@ touch ${WRKDIR}/src.conf
 [ ! -f ${POUDRIERED}/${JAILNAME}-src.conf ] || cat ${POUDRIERED}/${JAILNAME}-src.conf >> ${WRKDIR}/src.conf
 [ ! -f ${POUDRIERED}/image-${JAILNAME}-src.conf ] || cat ${POUDRIERED}/image-${JAILNAME}-src.conf >> ${WRKDIR}/src.conf
 [ ! -f ${POUDRIERED}/image-${JAILNAME}-${SETNAME}-src.conf ] || cat ${POUDRIERED}/image-${JAILNAME}-${SETNAME}-src.conf >> ${WRKDIR}/src.conf
-make -C ${mnt}/usr/src DESTDIR=${WRKDIR}/world BATCH_DELETE_OLD_FILES=yes SRCCONF=${WRKDIR}/src.conf delete-old delete-old-libs
+make -C ${mnt}/usr/src DESTDIR=${WRKDIR}/world BATCH_DELETE_OLD_FILES=yes SRCCONF=${WRKDIR}/src.conf delete-old delete-old-libs ||
 
 [ ! -d "${EXTRADIR}" ] || cp -fRPp ${EXTRADIR}/ ${WRKDIR}/world/
 if [ -f "${WRKDIR}/world/etc/login.conf.orig" ]; then