[Toybox] [CLEANUP] stat

[Felix Janda]

Hello,

some "cleanup" raising the SLOC...

The first patch makes stat support multiple files, fixes a format
string, inlines check_file_type() and adds functions do_stat()
do_statfs(), which do the system call and some preparations, to be
called via function pointers from main().

The second patch mainly inlines print_stat_format() splitting of
the big switch into print_stat() and print_statfs() to be called via
function pointers from main(). A nice side effect is that it now won't
segfault if you do something like "stat -f -c %B ."

For me this finishes the cleanup of stat.

Felix
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