kvx: gas: fix the detection of negative powers of 2 The detection of negative powers of 2 was wrong and could lead to well-formed bundles ending up taking more syllables than necessary. gas/ChangeLog: * config/kvx-parse.c (get_token_class): Use the signed value. * testsuite/gas/kvx/np2-detection.d: New test. * testsuite/gas/kvx/np2-detection.s: New test.