usb: gadget: Use kstrtobool() instead of strtobool()

strtobool() is the same as kstrtobool().
However, the latter is more used within the kernel.

In order to remove strtobool() and slightly simplify kstrtox.h, switch to
the other function name.

While at it, include the corresponding header file (<linux/kstrtox.h>)
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/09bc980d8432a4b5f7d88388ec0df5b085583139.1667336095.git.christophe.jaillet@wanadoo.frSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/configfs.c

@@ -3,6 +3,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/device.h>
+#include <linux/kstrtox.h>
 #include <linux/nls.h>
 #include <linux/usb/composite.h>
 #include <linux/usb/gadget_configfs.h>
@@ -800,7 +801,7 @@ static ssize_t os_desc_use_store(struct config_item *item, const char *page,
 	bool use;
 
 	mutex_lock(&gi->lock);
-	ret = strtobool(page, &use);
+	ret = kstrtobool(page, &use);
 	if (!ret) {
 		gi->use_os_desc = use;
 		ret = len;

drivers/usb/gadget/function/f_mass_storage.c

@@ -176,6 +176,7 @@
 #include <linux/fcntl.h>
 #include <linux/file.h>
 #include <linux/fs.h>
+#include <linux/kstrtox.h>
 #include <linux/kthread.h>
 #include <linux/sched/signal.h>
 #include <linux/limits.h>
@@ -3387,7 +3388,7 @@ static ssize_t fsg_opts_stall_store(struct config_item *item, const char *page,
 		return -EBUSY;
 	}
 
-	ret = strtobool(page, &stall);
+	ret = kstrtobool(page, &stall);
 	if (!ret) {
 		opts->common->can_stall = stall;
 		ret = len;

drivers/usb/gadget/function/storage_common.c

@@ -23,6 +23,7 @@
 #include <linux/blkdev.h>
 #include <linux/file.h>
 #include <linux/fs.h>
+#include <linux/kstrtox.h>
 #include <linux/usb/composite.h>
 
 #include "storage_common.h"
@@ -396,7 +397,7 @@ ssize_t fsg_store_ro(struct fsg_lun *curlun, struct rw_semaphore *filesem,
 	ssize_t		rc;
 	bool		ro;
 
-	rc = strtobool(buf, &ro);
+	rc = kstrtobool(buf, &ro);
 	if (rc)
 		return rc;
 
@@ -419,7 +420,7 @@ ssize_t fsg_store_nofua(struct fsg_lun *curlun, const char *buf, size_t count)
 	bool		nofua;
 	int		ret;
 
-	ret = strtobool(buf, &nofua);
+	ret = kstrtobool(buf, &nofua);
 	if (ret)
 		return ret;
 
@@ -470,7 +471,7 @@ ssize_t fsg_store_cdrom(struct fsg_lun *curlun, struct rw_semaphore *filesem,
 	bool		cdrom;
 	int		ret;
 
-	ret = strtobool(buf, &cdrom);
+	ret = kstrtobool(buf, &cdrom);
 	if (ret)
 		return ret;
 
@@ -493,7 +494,7 @@ ssize_t fsg_store_removable(struct fsg_lun *curlun, const char *buf,
 	bool		removable;
 	int		ret;
 
-	ret = strtobool(buf, &removable);
+	ret = kstrtobool(buf, &removable);
 	if (ret)
 		return ret;
 

drivers/usb/gadget/function/u_serial.c

@@ -24,6 +24,7 @@
 #include <linux/export.h>
 #include <linux/module.h>
 #include <linux/console.h>
+#include <linux/kstrtox.h>
 #include <linux/kthread.h>
 #include <linux/workqueue.h>
 #include <linux/kfifo.h>
@@ -1070,7 +1071,7 @@ ssize_t gserial_set_console(unsigned char port_num, const char *page, size_t cou
 	bool enable;
 	int ret;
 
-	ret = strtobool(page, &enable);
+	ret = kstrtobool(page, &enable);
 	if (ret)
 		return ret;
 

drivers/usb/gadget/legacy/serial.c

@@ -9,6 +9,7 @@
 
 #include <linux/kernel.h>
 #include <linux/device.h>
+#include <linux/kstrtox.h>
 #include <linux/module.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
@@ -109,7 +110,7 @@ static int enable_set(const char *s, const struct kernel_param *kp)
 	if (!s)	/* called for no-arg enable == default */
 		return 0;
 
-	ret = strtobool(s, &do_enable);
+	ret = kstrtobool(s, &do_enable);
 	if (ret || enable == do_enable)
 		return ret;