[AF_UNIX]: Change max_dgram_qlen sysctl to __read_mostly

Signed-off-by: NBrian Haley <brian.haley@hp.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/unix/af_unix.c

@@ -117,7 +117,7 @@
 #include <net/checksum.h>
 #include <linux/security.h>
 
-int sysctl_unix_max_dgram_qlen = 10;
+int sysctl_unix_max_dgram_qlen __read_mostly = 10;
 
 struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
 DEFINE_SPINLOCK(unix_table_lock);