Fix syntax error on Linux/X32

Patch from Mike Frysinger
diff --git a/sandbox-seccomp-filter.c b/sandbox-seccomp-filter.c
index 3a1aedc..a8d472a 100644
--- a/sandbox-seccomp-filter.c
+++ b/sandbox-seccomp-filter.c
@@ -235,7 +235,7 @@
 	 * x86-64 syscall under some circumstances, e.g.
 	 * https://bugs.debian.org/849923
 	 */
-	SC_ALLOW(__NR_clock_gettime & ~__X32_SYSCALL_BIT);
+	SC_ALLOW(__NR_clock_gettime & ~__X32_SYSCALL_BIT),
 #endif
 
 	/* Default deny */