[Toybox] [PATCH] linestack.c: fix buffer length.

[enh]

GCC 8.2 (which my laptop appears to have been quietly upgraded to)
points out that the %04X of an int might actually take 8 characters;
between that, the "U+", and the trailing NUL, we're gonna need a
bigger boat...
---
 lib/linestack.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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