staging: zcache: mark zbud_init/zcache_comp_init as __init

These functions are called only when system is initializing, so mark __init
for them to free memory

Acked-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/zcache/zcache-main.c

@@ -600,7 +600,7 @@ out:
 	return;
 }
 
-static void zbud_init(void)
+static void __init zbud_init(void)
 {
 	int i;
 
@@ -1985,7 +1985,7 @@ static int __init enable_zcache_compressor(char *s)
 __setup("zcache=", enable_zcache_compressor);
 
 
-static int zcache_comp_init(void)
+static int __init zcache_comp_init(void)
 {
 	int ret = 0;