coff-z80 reloc howto fixes

Mostly cosmetic unless attempting to link coff-z80 into another output
format.

	* coff-z80.c (howto_table <R_IMM24, R_WORD0, R_WORD1>): Correct size.
	(extra_case): Use bfd_{get,put}_24 when applying R_IMM24.
1 file changed