Tools/scripts/sed_checked.sh: reword sed warning

The original wording was misleading and might have mistaken for
identical file names, but what is meant is that the sed run did not
introduce changes to the file's __content__. Reword accordingly.

Tools/scripts/sed_checked.sh

@@ -6,7 +6,7 @@ for x in "${@}" ; do
     if [ -f "${x}" ]; then
 	if cmp -s "${x}" "${x}".bak ; then
             if [ ! -z "${REWARNFILE}" ]; then
-                echo sed failed: backup file same as original: ${x#${WRKSRC}/} >> ${REWARNFILE}
+                echo sed failed: file content unchanged from backup: ${x#${WRKSRC}/} >> ${REWARNFILE}
             fi
         fi
     fi