AudioRecord: Fix minimum frame count calculation.

AudioRecord::set() was calling getMinFrameCount() with
a channel count instead of a channel mask.

Change-Id: Iabace7686426430fd53deac0c71b0c36aa64171c
diff --git a/media/libmedia/AudioRecord.cpp b/media/libmedia/AudioRecord.cpp
index 5060525..8ea6306 100644
--- a/media/libmedia/AudioRecord.cpp
+++ b/media/libmedia/AudioRecord.cpp
@@ -177,7 +177,7 @@
 
     // validate framecount
     int minFrameCount = 0;
-    status_t status = getMinFrameCount(&minFrameCount, sampleRate, format, channelCount);
+    status_t status = getMinFrameCount(&minFrameCount, sampleRate, format, channelMask);
     if (status != NO_ERROR) {
         return status;
     }