The makefile didn't get updated when the driver changed name, which broke
the build.
Signed-off-by: Matthew Garrett <mjg@redhat.com>
 obj-$(CONFIG_HP_WMI)           += hp-wmi.o
 obj-$(CONFIG_TC1100_WMI)       += tc1100-wmi.o
 obj-$(CONFIG_SONY_LAPTOP)      += sony-laptop.o
-obj-$(CONFIG_IDEAPAD_LAPTOP)   += ideapad_laptop.o
+obj-$(CONFIG_IDEAPAD_LAPTOP)   += ideapad-laptop.o
 obj-$(CONFIG_THINKPAD_ACPI)    += thinkpad_acpi.o
 obj-$(CONFIG_FUJITSU_LAPTOP)   += fujitsu-laptop.o
 obj-$(CONFIG_PANASONIC_LAPTOP) += panasonic-laptop.o