kmemleak: When the early log buffer is exceeded, report the actual number

Just telling that the early log buffer has been exceeded doesn't mean
much. This patch moves the error printing to the kmemleak_init()
function and displays the actual calls to the kmemleak API during early
logging.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --cc mm/kmemleak.c
Simple merge