Fix a core dump when doing 'tosha -i'. (Maintainer timeout after about two

months.)

The problem is in resolve_extension().  strncpy() will only null-terminate
the destination string if it has enough room, according to the given
length.

In this implementation, there will never be enough room to null-terminate
the string, from what I can tell.  So if the memory in 'tmpstr' contains
non-nulls, you'll get a core-dump in the subsequent strcat().

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