PR gas/5543 broke mmix: "can't equate global symbol foo with register name"

I see:
Running /home/hp/binutils/src/ld/testsuite/ld-mmix/mmix.exp ...
...
FAIL: ld-mmix/bpo-13
FAIL: ld-mmix/bpo-13m
FAIL: ld-mmix/local1
FAIL: ld-mmix/local1m
FAIL: ld-mmix/local2
FAIL: ld-mmix/local2m
FAIL: ld-mmix/local5
FAIL: ld-mmix/local5m
FAIL: ld-mmix/reg-1
FAIL: ld-mmix/reg-1m

where entries in ld.log say e.g.:
binutils/src/ld/testsuite/ld-mmix/areg-256.s:2: Error: can't equate global symbol `areg' with register name

This used to work.  cvs ann read.c shows you added the error
message above around March 3 to fix PR gas/5543.  Please fix the fix.

brgds, H-P