PR28175, Segment fault in coff-tic30.c reloc_processing

The obj_convert table shouldn't be accessed without first checking the
index against the table size.

	PR 28175
	* coff-tic30.c (reloc_processing): Sanity check reloc symbol index.
	* coff-z80.c (reloc_processing): Likewise.
	* coff-z8k.c (reloc_processing): Likewise.
3 files changed