Staging: cpc-usb: depends on PROC_FS

Fix this build error when PROC_FS is not enabled:
cpc-usb_drv.c:61:2: error: #error "PROCFS needed"
cpc-usb_drv.c:1159: error: implicit declaration of function 'proc_mkdir'
Signed-off-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/cpc-usb/Kconfig

 config USB_CPC
 	tristate "CPC CAN USB driver"
-	depends on USB
+	depends on USB && PROC_FS
 	default n

drivers/staging/cpc-usb/cpc-usb_drv.c

@@ -30,9 +30,7 @@
 
 #include <linux/version.h>
 
-#ifdef CONFIG_PROC_FS
-#   include <linux/proc_fs.h>
-#endif
+#include <linux/proc_fs.h>
 
 #include "cpc.h"
 
@@ -57,10 +55,6 @@ MODULE_LICENSE("GPL v2");
 #define USB_CPCUSB_M16C_PRODUCT_ID    0x0888
 #define USB_CPCUSB_LPC2119_PRODUCT_ID 0x0444
 
-#ifndef CONFIG_PROC_FS
-#error "PROCFS needed"
-#endif
-
 #define CPC_USB_PROC_DIR     CPC_PROC_DIR "cpc-usb"
 
 static struct proc_dir_entry *procDir;

drivers/staging/cpc-usb/cpc_int.h

@@ -15,9 +15,7 @@
 
 #define CPC_MSG_BUF_CNT	1500
 
-#ifdef CONFIG_PROC_FS
-#   define CPC_PROC_DIR "driver/"
-#endif
+#define CPC_PROC_DIR "driver/"
 
 #undef dbg
 #undef err