efi: Fix error handling in add_sysfs_runtime_map_entry()
I spotted two (difficult to hit) bugs while reviewing this. 1) There is a double free bug because we unregister "map_kset" in add_sysfs_runtime_map_entry() and also efi_runtime_map_init(). 2) If we fail to allocate "entry" then we should return ERR_PTR(-ENOMEM) instead of NULL. Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com> Cc: Dave Young <dyoung@redhat.com> Cc: Guangyu Sun <guangyu.sun@oracle.com> Cc: <stable@vger.kernel.org> Signed-off-by: NMatt Fleming <matt.fleming@intel.com>
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