Strange kernel build breakage (after r314283?)

 I've got this error when tried to update my -CURRENT VM to r314772:

/data/src/sys/cam/cam_xpt.c:84:1: error: static_assert failed
"XPT_PRINT_LEN is too large"
_Static_assert(XPT_PRINT_LEN <= XPT_PRINT_MAXLEN, "XPT_PRINT_LEN is too
large");
^              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 I didn't define any XPT_xxxx macro by hands, but I have

options         PRINTF_BUFR_SIZE=1024

 in my kernel config.

-- 
// Lev Serebryakov