adb backup: fix building and relink

Change-Id: Ic65284ac2b3f4f410b3ad79288e8b39f51bcc5ee
diff --git a/adbbu/Android.mk b/adbbu/Android.mk
index 23a58f3..c05f265 100755
--- a/adbbu/Android.mk
+++ b/adbbu/Android.mk
@@ -43,6 +43,5 @@
 LOCAL_MODULE_STEM := bu
 LOCAL_MODULE_TAGS:= optional
 LOCAL_MODULE_CLASS := RECOVERY_EXECUTABLES
-LOCAL_MODULE_PATH := $(TARGET_RECOVERY_ROOT_OUT)/
+LOCAL_MODULE_PATH := $(TARGET_RECOVERY_ROOT_OUT)/system/bin
 include $(BUILD_EXECUTABLE)
-