[CIFS] Make CONFIG_CIFS_EXPERIMENTAL depend on CONFIG_EXPERIMENTAL

It seems logical.

Note that CONFIG_EXPERIMENTAL itself doesn't enable any code.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/Kconfig

@@ -1639,7 +1639,7 @@ config CIFS_POSIX
 
 config CIFS_EXPERIMENTAL
 	  bool "CIFS Experimental Features (EXPERIMENTAL)"
-	  depends on CIFS
+	  depends on CIFS && EXPERIMENTAL
 	  help
 	    Enables cifs features under testing. These features
 	    are highly experimental.  If unsure, say N.