Previously, the code did not call kobject_put when sysfs_create_file
failed, leading to a potential memory leak. This commit adds the missing
kobject_put to ensure proper resource cleanup.
The function pointer type of myvariable_store was incompatible with the
store member of struct kobj_attribute, leading to a compilation error
when the type conversion (void *) was omitted. This patch corrects the
function declaration and eliminates the need for type conversion.
As myvariable is declared as an integer, it is meaningless that putting
u after %d in the format specifier of sscanf for scanning an integer.
This patch removes the u in the format specifier for avoiding
misleading.
