lexer: Fix negative 'n0' and 'n1' in lex_source_contains_macro_call().
[pspp] / lib / linreg /
drwxr-xr-x   ..
-rw-r--r-- 935 automake.mk
-rw-r--r-- 4048 sweep.c
-rw-r--r-- 2105 sweep.h