AudioFlinger: Remove unnecessary computation

Test: Build and basic record sanity
Bug: 112142872
Change-Id: Ibfc0c715930593c23e58acd4afda6986d69d53b2
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 79147af..3ef8ce2 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -6733,8 +6733,7 @@
 
         // If an NBAIO source is present, use it to read the normal capture's data
         if (mPipeSource != 0) {
-            size_t framesToRead = mBufferSize / mFrameSize;
-            framesToRead = min(mRsmpInFramesOA - rear, mRsmpInFramesP2 / 2);
+            size_t framesToRead = min(mRsmpInFramesOA - rear, mRsmpInFramesP2 / 2);
 
             // The audio fifo read() returns OVERRUN on overflow, and advances the read pointer
             // to the full buffer point (clearing the overflow condition).  Upon OVERRUN error,