cifs: don't cargo-cult strndup()

strndup(s, strlen(s)) is a highly unidiomatic way to spell strdup(s);
it's *NOT* safer in any way, since strlen() is just as sensitive to
NUL-termination as strdup() is.

strndup() is for situations when you need a copy of a known-sized
substring, not a magic security juju to drive the bad spirits away.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steve French <stfrench@microsoft.com>
diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c
index 7888902..7652f73 100644
--- a/fs/cifs/fs_context.c
+++ b/fs/cifs/fs_context.c
@@ -430,7 +430,7 @@ int smb3_parse_opt(const char *options, const char *key, char **val)
 			if (nval == p)
 				continue;
 			*nval++ = 0;
-			*val = kstrndup(nval, strlen(nval), GFP_KERNEL);
+			*val = kstrdup(nval, GFP_KERNEL);
 			rc = !*val ? -ENOMEM : 0;
 			goto out;
 		}