Fix bug in i18n/l10n optimization
This fixes a off-by-one buffer overrun bug introduced in 2017-06-04T15:39:37Zemail@example.com. Problem uncovered by an experimental version of Emacs built with -fcheck-pointer-bounds and running on Intel MPX hardware. * src/editfns.c (styled_format): Avoid overrunning internal buffers.
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