kobject: Use return value of strreplace()

Since strreplace() returns the pointer to the string itself,
we may use it directly in the code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230605170553.7835-4-andriy.shevchenko@linux.intel.com

Author: andy-shev

lib/kobject.c

@@ -281,8 +281,7 @@ int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
 		kfree_const(s);
 		if (!t)
 			return -ENOMEM;
-		strreplace(t, '/', '!');
-		s = t;
+		s = strreplace(t, '/', '!');
 	}
 	kfree_const(kobj->name);
 	kobj->name = s;