[Xtensa] fix GAS build with GCC 4.3

[Bob Wilson]

H.J. forwarded to me a patch from Adrian Bunk to fix a problem building GAS for 
Xtensa with GCC 4.3.  There was a missing return code check that caused a 
warning, which was fatal with -Werror.  I simplified the patch slightly and 
committed it after verifying that I could build all of binutils for an 
xtensa-elf target with GCC 4.3.

Thanks Adrian and H.J.

2008-04-04  Adrian Bunk  <bunk@stusta.de>
	    Bob Wilson  <bob.wilson@acm.org>
	
	* config/tc-xtensa.c (xg_apply_fix_value): Check return code from
	call to decode_reloc.
	
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