Fix misc-macro-parentheses warnings.

Bug: 28705665
Change-Id: Ia4ce811e33d0f6467f7ee33c2330001ff8ed2f40
diff --git a/jni/fmr/fmr_err.cpp b/jni/fmr/fmr_err.cpp
index df42f65..0f0035a 100644
--- a/jni/fmr/fmr_err.cpp
+++ b/jni/fmr/fmr_err.cpp
@@ -21,7 +21,7 @@
 #endif
 #define LOG_TAG "FMLIB_ERR"
 
-#define FMR_ERR_BASE -0x100
+#define FMR_ERR_BASE (-0x100)
 
 static int fmr_err = 0;
 static char tmp[20] = {0};