module: 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: NChristophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: NLuis Chamberlain <mcgrof@kernel.org>
Reviewed-by: NAaron Tomlin <atomlin@atomlin.com>
Signed-off-by: NLuis Chamberlain <mcgrof@kernel.org>

kernel/module/main.c

@@ -17,6 +17,7 @@
 #include <linux/fs.h>
 #include <linux/kernel.h>
 #include <linux/kernel_read_file.h>
+#include <linux/kstrtox.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/elf.h>
@@ -2675,7 +2676,7 @@ static int unknown_module_param_cb(char *param, char *val, const char *modname,
 	int ret;
 
 	if (strcmp(param, "async_probe") == 0) {
-		if (strtobool(val, &mod->async_probe_requested))
+		if (kstrtobool(val, &mod->async_probe_requested))
 			mod->async_probe_requested = true;
 		return 0;
 	}