[visium] Fix bogus overflow check on 32-bit hosts

[Eric Botcazou]

Trying to be as clever as the compiler inevitably leads to bugs...

Tested for visium-elf, applied on mainline, 2.32 and 2.31 branches.


2019-02-07  Eric Botcazou  <ebotcazou@adacore.com>

bfd/
	* elf32-visium.c (visium_elf_howto_parity_reloc): Minor tweak.
	<R_VISIUM_PC16>: Use explicit range test to detect an overflow.

-- 
Eric Botcazou
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