staging: zcache: fix typo "64_BIT"

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/zcache/Kconfig

@@ -15,7 +15,7 @@ config RAMSTER
 	depends on CONFIGFS_FS=y && SYSFS=y && !HIGHMEM && ZCACHE=y
 	depends on NET
 	# must ensure struct page is 8-byte aligned
-	select HAVE_ALIGNED_STRUCT_PAGE if !64_BIT
+	select HAVE_ALIGNED_STRUCT_PAGE if !64BIT
 	default n
 	help
 	  RAMster allows RAM on other machines in a cluster to be utilized