gui: Fix return code assert in CpuConsumer_test.

The CpuConsumer error code was changed recently from INVALID_OPERATION to
NOT_ENOUGH_DATA, however the CpuConsumer_test was not updated. This change
fixes the return code checked by CpuConsumer_test so the test no longer
fails.

Change-Id: Ie548ddcb313fa34c130ac63355090cb44ac15ebf
diff --git a/libs/gui/tests/CpuConsumer_test.cpp b/libs/gui/tests/CpuConsumer_test.cpp
index afbc026..b370a2d 100644
--- a/libs/gui/tests/CpuConsumer_test.cpp
+++ b/libs/gui/tests/CpuConsumer_test.cpp
@@ -656,7 +656,7 @@
     ALOGV("Locking frame %d (too many)", params.maxLockedBuffers);
     CpuConsumer::LockedBuffer bTooMuch;
     err = mCC->lockNextBuffer(&bTooMuch);
-    ASSERT_TRUE(err == INVALID_OPERATION) << "Allowing too many locks";
+    ASSERT_TRUE(err == NOT_ENOUGH_DATA) << "Allowing too many locks";
 
     ALOGV("Unlocking frame 0");
     err = mCC->unlockBuffer(b[0]);