x86/bugs: Fix the parameters alignment and missing void

Fixes: 7bb4d366 ("x86/bugs: Make cpu_show_common() static")
Fixes: 24f7fc83 ("x86/bugs: Provide boot parameters for the spec_store_bypass_disable mitigation")
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

CVE-2018-3639 (x86)

(cherry-picked from commit ffed645e)
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

arch/x86/kernel/cpu/bugs.c

@@ -556,7 +556,7 @@ static enum ssb_mitigation __init __ssb_select_mitigation(void)
 	return mode;
 }
 
-static void ssb_select_mitigation()
+static void ssb_select_mitigation(void)
 {
 	ssb_mode = __ssb_select_mitigation();