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Fix expand_atomic_fetch_op wrt unused_result

From: Richard Henderson <rth at redhat dot com>
To: GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Sat, 26 Nov 2011 16:15:36 -0800
Subject: Fix expand_atomic_fetch_op wrt unused_result

Testing on coldfire revealed a double call to library functions for some omp atomic calls.  This was due to this function trying to return "target" for success for unused_result.  Except that for unused_result, target is null, which indicates expansion failure.  Oops.


r~

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