[PATCH] usb: gadget: configfs: Make check_user_usb_string() static

[Christophe JAILLET]

"linux/usb/gadget_configfs.h" is only included in
"drivers/usb/gadget/configfs.c", so there is no need to declare a function
in the header file. it is only used in this .c file.

It's better to have it static.

Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
I've not checked, but I suspect gcc to both inline check_user_usb_string()
in its only caller and keep it as-is for any potential other callers.

Before:
======
$ size drivers/usb/gadget/configfs.o
   text	   data	    bss	    dec	    hex	filename
  41197	   5120	     64	  46381	   b52d	drivers/usb/gadget/configfs.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  40834	   5112	     64	  46010	   b3ba	drivers/usb/gadget/configfs.o
---
 drivers/usb/gadget/configfs.c       | 2 +-
 include/linux/usb/gadget_configfs.h | 3 ---
 2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index 0e7c1e947c0a..e0bf2b2bfc01 100644
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -12,7 +12,7 @@
 #include "u_f.h"
 #include "u_os_desc.h"
 
-int check_user_usb_string(const char *name,
+static int check_user_usb_string(const char *name,
 		struct usb_gadget_strings *stringtab_dev)
 {
 	u16 num;
diff --git a/include/linux/usb/gadget_configfs.h b/include/linux/usb/gadget_configfs.h
index d61aebd68128..6a552dd4dec9 100644
--- a/include/linux/usb/gadget_configfs.h
+++ b/include/linux/usb/gadget_configfs.h
@@ -4,9 +4,6 @@
 
 #include <linux/configfs.h>
 
-int check_user_usb_string(const char *name,
-		struct usb_gadget_strings *stringtab_dev);
-
 #define GS_STRINGS_W(__struct, __name)	\
 static ssize_t __struct##_##__name##_store(struct config_item *item, \
 		const char *page, size_t len)		\
-- 
2.46.0