[MPlayer-dev-eng] [PATCH] Fix key_down_event SEGFALT

[spunit262 .]

I discovered by messing around that using key_down_event with a large
random value (ex SPACE | MP_NO_REPEAT_KEY) can cause a segfalt.
I found the problem to be that isprint is only defined for values in
the range of an unsigned char and the value EOF.
The patch adds a simple check before isprint in mp_input_get_key_name
to make sure the value is in isprint's range.
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