bcon: make console_bytes atomic64_t

u64 has no alignment guarantees and given the layout of the structure
there was a 50/50 chance of console_bytes being aligned or not,
depending on config options.  Was caught by Fengguang Wu's build bot,
due to a build failure on avr32.

Signed-off-by: Joern Engel <joern@logfs.org>
1 file changed