x86: Convert vmalloc()+memset() to vzalloc()

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Jiri Kosina <trivial@kernel.org>
Link: http://lkml.kernel.org/r/10e35243fda0b8739c89ac32a7bdf348ec4752e1.1306603968.git.joe@perches.com


Signed-off-by: Ingo Molnar <mingo@elte.hu>