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If a .shift request has a negative argument, do not use a negative array
index but use 0 instead of the argument, just like groff.
Warn about the invalid argument.
While here, fix the column number in another warning message.

Segfault reported by tb@, found with afl(1).

mandoc: bad.in:14:29: ERROR: using macro argument outside macro: \$1
mandoc: bad.in:15:2: ERROR: ignoring request outside macro: shift
mandoc: bad.in:17:31: ERROR: argument number is not numeric: \$x
mandoc: bad.in:19:28: ERROR: using macro argument outside macro: \$1
mandoc: bad.in:20:2: ERROR: ignoring request outside macro: shift
mandoc: bad.in:32:8: ERROR: argument is not numeric, using 1: shift badarg
mandoc: bad.in:32:8: ERROR: negative argument, using 0: shift -1
mandoc: bad.in:32:8: ERROR: excessive shift: 2, but max is 1