kernel: Fix building recovery images

Commit 8ac7d31 introduced this issue.

Test: run `m recoveryimage` and verify that recovery
image is now built.

Change-Id: Iffdd8112db2ba1baff28db7ee4c340dbb5ebd917
diff --git a/build/tasks/kernel.mk b/build/tasks/kernel.mk
index 8bdbd22..ef6ae8f 100644
--- a/build/tasks/kernel.mk
+++ b/build/tasks/kernel.mk
@@ -479,7 +479,7 @@
 $(RECOVERY_KERNEL_OUT):
 	mkdir -p $(RECOVERY_KERNEL_OUT)
 
-$(RECOVERY_KERNEL_CONFIG): $(ALL_RECOVERY_DEFCONFIG_SRCS)
+$(RECOVERY_KERNEL_CONFIG): $(ALL_RECOVERY_KERNEL_DEFCONFIG_SRCS)
 	@echo "Building Recovery Kernel Config"
 	$(call make-kernel-config,$(RECOVERY_KERNEL_OUT),$(RECOVERY_DEFCONFIG))