mn10300's btst, bclr and bset broken

[Alexandre Oliva]

This patch:

2001-04-14  Alexandre Oliva  <aoliva@redhat.com>

	* config/tc-mn10300.c (md_assemble): Simplify offset adjustment of
	pc-relative relocations not placed at the end of the instruction.

broke btst, bclr and bset, because the offset of the address into the
instruction wasn't taken into account when computing the relocation
address.  This patch fixes it.  I'm checking it in, approved by Eric
Christopher: