Rephrase to avoid integer overflow

Bug: 179046129
Test: atest sf_foundation_test w/local additions
Change-Id: Ie86897fb6283b22745d2fc0cb9b9ea22736193a0
(cherry picked from commit 522b7979)

media/libstagefright/foundation/ABuffer.cpp

@@ -67,7 +67,7 @@ ABuffer::~ABuffer() {
 
 void ABuffer::setRange(size_t offset, size_t size) {
     CHECK_LE(offset, mCapacity);
-    CHECK_LE(offset + size, mCapacity);
+    CHECK_LE(size, mCapacity - offset);
 
     mRangeOffset = offset;
     mRangeLength = size;