Fix PCMCIA typo (extra 'R') that broke the compile.

drivers/pcmcia/cs.c

@@ -1061,7 +1061,7 @@ int pcmcia_bind_mtd(mtd_bind_t *req)
 
 /*====================================================================*/
 
-int pcmcia_deregister_clientR(client_handle_t handle)
+int pcmcia_deregister_client(client_handle_t handle)
 {
     client_t **client;
     struct pcmcia_socket *s;