Fix typo: ifndef -> ifneq

Change-Id: Id71c70b6fcd2659078a19cc652fd02807372f3a0
diff --git a/liblog/tests/Android.mk b/liblog/tests/Android.mk
index 255dc2e..6c72138 100644
--- a/liblog/tests/Android.mk
+++ b/liblog/tests/Android.mk
@@ -70,7 +70,7 @@
 test_src_files += \
     libc_test.cpp
 
-ifndef ($(TARGET_USES_LOGD),false)
+ifneq ($(TARGET_USES_LOGD),false)
 test_c_flags += -DTARGET_USES_LOGD
 endif