xl: Comment error handling in dolog

Coverity-ID: 1087116
Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
CC: coverity@xenproject.org

tools/libxl/xl_cmdimpl.c

@@ -352,6 +352,8 @@ static void dolog(const char *file, int line, const char *func, char *fmt, ...)
     rc = vasprintf(&s, fmt, ap);
     va_end(ap);
     if (rc >= 0)
+        /* we ignore write errors since we have no way to report them;
+         * the alternative would be to abort the whole program */
         libxl_write_exactly(NULL, logfile, s, rc, NULL, NULL);
     free(s);
 }