Avoid floating-point exceptions while drawing underwave
* src/w32term.c (x_get_scale_factor): * src/xterm.c (x_get_scale_factor): Don't let the scale factors become less than 1. Reported by Yuri D'Elia <wavexx@thregr.org> in http://lists.gnu.org/archive/html/emacs-devel/2017-08/msg00459.html.
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