kernel: platform/x86: dell-smbios-wmi: Fix oops on rmmod dell_smbios

In the Linux kernel, the following vulnerability has been resolved: platform/x86: dell-smbios-wmi: Fix oops on rmmod dellsmbios initdellsmbioswmi only registers the dellsmbioswmidriver on systems where the Dell WMI interface is supported. While exitdellsmbioswmi unregisters it unconditionally, th...