assemble: avoid redundant repetition in RESx warning message
assemble: avoid redundant repetition in RESx warning message

Clean up the language in this warning message, so as not be so
unnecessarily repetitive.

Signed-off-by: H. Peter Anvin <8a453bad9912ffe59bc0f0b8abe03df9be19379e@zytor.com>

techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm,techkey/nasm