Fix FAN_RESPONSE_MASK

The mask as it is, was letting syslog notifications through. While the
bit it is using is undefined. One day it might be. So, correct the mask
to only provide the bits that the kernel understands.

src/library/policy.h

@@ -42,7 +42,7 @@
 #endif
 
 #define SYSLOG 0x0020
-#define FAN_RESPONSE_MASK 0x001F
+#define FAN_RESPONSE_MASK FAN_ALLOW|FAN_DENY|FAN_AUDIT
 
 typedef enum {
 	NO_OPINION = 0,