libceph: fix wrong name "Ceph filesystem for Linux"

modinfo libceph prints the module name "Ceph filesystem for Linux",
which is same as the real fs module ceph. It's confusing.

Signed-off-by: Hong Zhiguo <zhiguohong@tencent.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
index 925d0c8..cb7db32 100644
--- a/net/ceph/ceph_common.c
+++ b/net/ceph/ceph_common.c
@@ -741,5 +741,5 @@
 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
-MODULE_DESCRIPTION("Ceph filesystem for Linux");
+MODULE_DESCRIPTION("Ceph core library");
 MODULE_LICENSE("GPL");