[PATCH] Fix another ARM GAS segment fault

[Jie Zhang]

Even with the patch

http://sourceware.org/ml/binutils/2010-03/msg00262.html

there is still another case which will cause ARM GAS to crash. It's 
possible that a new mapping symbol will be created at address 0 while 
there is already another mapping symbol at address 0. So when we see 
value == 0, we cannot assert first_map == NULL. This patch fixes it. No 
regressions. Is it OK?


-- 
Jie Zhang
CodeSourcery
(650) 331-3385 x735
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