MAINTAINERS: rename cifs_common to smbfs_common in cifs and ksmbd entry

commit 23e91d8b("cifs: rename cifs_common to smbfs_common") cause
the following warning from get_maintainer.pl.

./scripts/get_maintainer.pl --self-test=patterns complains:
  warning: no file matches    F:    fs/cifs_common/

This patch rename cifs_common to smbfs_common in cifs and ksmbd entry.
Reported-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

MAINTAINERS

@@ -4655,7 +4655,7 @@ W:	http://linux-cifs.samba.org/
 T:	git git://git.samba.org/sfrench/cifs-2.6.git
 F:	Documentation/admin-guide/cifs/
 F:	fs/cifs/
-F:	fs/cifs_common/
+F:	fs/smbfs_common/
 
 COMPACTPCI HOTPLUG CORE
 M:	Scott Murray <scott@spiteful.org>
@@ -10193,8 +10193,8 @@ M:	Hyunchul Lee <hyc.lee@gmail.com>
 L:	linux-cifs@vger.kernel.org
 S:	Maintained
 T:	git git://git.samba.org/ksmbd.git
-F:	fs/cifs_common/
 F:	fs/ksmbd/
+F:	fs/smbfs_common/
 
 KERNEL UNIT TESTING FRAMEWORK (KUnit)
 M:	Brendan Higgins <brendanhiggins@google.com>