sbat: use correct type for parse_sbat_var() return value
sbat: use correct type for parse_sbat_var() return value

Signed-off-by: Javier Martinez Canillas <8fdf2abf85d34ea8f3f979ef25dc1f25d94aca29@redhat.com>

rhinstaller/shim,rhinstaller/shim,rhinstaller/shim