fuchsia: Fix fuchsia build

Change-Id: I5f4dd377a571a92bbcad32d772615fa45f0b48dd
diff --git a/system/OpenglSystemCommon/QemuPipeStreamFuchsia.cpp b/system/OpenglSystemCommon/QemuPipeStreamFuchsia.cpp
index 83c81ac..6a236f1 100644
--- a/system/OpenglSystemCommon/QemuPipeStreamFuchsia.cpp
+++ b/system/OpenglSystemCommon/QemuPipeStreamFuchsia.cpp
@@ -129,7 +129,7 @@
     }
 
     {
-        result = m_pipe->Write(len + 1, 0);
+        auto result = m_pipe->Write(len + 1, 0);
         if (!result.ok() || result.Unwrap()->res != ZX_OK) {
             ALOGD("%s: connecting to pipe service failed: %d:%d", __FUNCTION__,
                   result.status(), GET_STATUS_SAFE(result, res));