Use String8/16 c_str [audio]

Bug: 295394788
Test: make checkbuild
Change-Id: Idd3610f6820093bd8710a401f87a136cc26279c5
Merged-In: Idd3610f6820093bd8710a401f87a136cc26279c5
diff --git a/media/libaudioclient/AudioRecord.cpp b/media/libaudioclient/AudioRecord.cpp
index 91b54a8..00c6d63 100644
--- a/media/libaudioclient/AudioRecord.cpp
+++ b/media/libaudioclient/AudioRecord.cpp
@@ -745,7 +745,7 @@
                         mInput, mLatency, mSelectedDeviceId, mRoutedDeviceId);
     result.appendFormat("  mic direction(%d) mic field dimension(%f)",
                         mSelectedMicDirection, mSelectedMicFieldDimension);
-    ::write(fd, result.string(), result.size());
+    ::write(fd, result.c_str(), result.size());
     return NO_ERROR;
 }