dell-smbios: rename release_buffer() to dell_smbios_release_buffer()

dell-smbios: rename release_buffer() to dell_smbios_release_buffer()

As release_buffer() is exported from the module, it has to be renamed to
something less generic, so add a "dell_smbios_" prefix to the function
name.

Signed-off-by: Michał Kępień <[email protected]>
Reviewed-by: Pali Rohár <[email protected]>
Signed-off-by: Darren Hart <[email protected]>