Fix misc-macro-parentheses warnings in aapt and androidfw.

Bug: 28705665
Change-Id: Iac353e66718aadad384183cf300330695df25909
diff --git a/tools/aapt/StringPool.cpp b/tools/aapt/StringPool.cpp
index 9908c44..37a4933 100644
--- a/tools/aapt/StringPool.cpp
+++ b/tools/aapt/StringPool.cpp
@@ -390,12 +390,12 @@
 
 #define ENCODE_LENGTH(str, chrsz, strSize) \
 { \
-    size_t maxMask = 1 << ((chrsz*8)-1); \
+    size_t maxMask = 1 << (((chrsz)*8)-1); \
     size_t maxSize = maxMask-1; \
-    if (strSize > maxSize) { \
-        *str++ = maxMask | ((strSize>>(chrsz*8))&maxSize); \
+    if ((strSize) > maxSize) { \
+        *(str)++ = maxMask | (((strSize)>>((chrsz)*8))&maxSize); \
     } \
-    *str++ = strSize; \
+    *(str)++ = strSize; \
 }
 
 status_t StringPool::writeStringBlock(const sp<AaptFile>& pool)