[PATCH] fix infocmp/tic hang

[Emanuele Giaquinta]

Hello,

starting with ncurses-6.0-20170506, infocmp and tic -c hang with
terminal descriptions specifying pairs#7744. The problem is that
dump_entry.c:number_format does not terminate if the input number
does not belong to any of the tested intervals, because the
expression (mm = (1UL << nn)) never becomes zero. The behaviour is
undefined for nn equal to 32 (or 64), and on x86 the SHL instruction
considers only the lowest 5 (or 6) bits of the shift count so the
expression wraps to 1. The attached patch fixes the issue.

Emanuele

dump_entry.diff
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