libceph: amend "bad option arg" error message

Don't mention "mount" -- in the rbd case it is "mapping".

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
index 1677a61..6ebd7d9 100644
--- a/net/ceph/ceph_common.c
+++ b/net/ceph/ceph_common.c
@@ -396,8 +396,7 @@ ceph_parse_options(char *options, const char *dev_name,
 		if (token < Opt_last_int) {
 			err = match_int(&argstr[0], &intval);
 			if (err < 0) {
-				pr_err("bad mount option arg (not int) "
-				       "at '%s'\n", c);
+				pr_err("bad option arg (not int) at '%s'\n", c);
 				goto out;
 			}
 			dout("got int token %d val %d\n", token, intval);