aaudio: fix resource leak in client tracking

Was using the wrong pid.

Bug: 38267698
Test: run an aaudio example like write_sine.cpp and control-C in the middle
Change-Id: I8819fcdd78354554b926d8b8a59efa1a81fed110
diff --git a/services/oboeservice/AAudioServiceStreamBase.h b/services/oboeservice/AAudioServiceStreamBase.h
index d83d5ab..2898211 100644
--- a/services/oboeservice/AAudioServiceStreamBase.h
+++ b/services/oboeservice/AAudioServiceStreamBase.h
@@ -126,6 +126,13 @@
         mOwnerUserId = uid;
     }
 
+    pid_t getOwnerProcessId() const {
+        return mOwnerProcessId;
+    }
+    void setOwnerProcessId(pid_t pid) {
+        mOwnerProcessId = pid;
+    }
+
     aaudio_handle_t getHandle() const {
         return mHandle;
     }
@@ -159,6 +166,7 @@
     int32_t            mSampleRate = AAUDIO_UNSPECIFIED;
     int32_t            mCapacityInFrames = AAUDIO_UNSPECIFIED;
     uid_t              mOwnerUserId = -1;
+    pid_t              mOwnerProcessId = -1;
 private:
     aaudio_handle_t    mHandle = -1;
 };