escnonprint has been replaced by quotearg_style; reflect that change in comments too

src/ftp-basic.c

@@ -68,7 +68,7 @@ ftp_response (int fd, char **ret_line)
         return FTPRERR;
 
       /* Strip trailing CRLF before printing the line, so that
-         escnonprint doesn't include bogus \012 and \015. */
+         quotting doesn't include bogus \012 and \015. */
       p = strchr (line, '\0');
       if (p > line && p[-1] == '\n')
         *--p = '\0';