[Toybox] [PATCH] mkdir: return error for existing directories without -p flag

[Mikhail Kashkarov]

Hello, we've noticed that mkdir returns 0 for already existed
directories (which was not expected behaviour), patch attached below.

# currently:
$ (./toybox mkdir d; ./toybox mkdir d); echo $?; ./toybox rmdir d
0

# expected:
$ (mkdir d; mkdir d); echo $?; rmdir d
mkdir: cannot create directory ‘d’: File exists
1

# patched:
$ (./toybox mkdir d; ./toybox mkdir d); echo $?; ./toybox rmdir d
mkdir: 'd': File exists
1

-- 
Mikhail K.

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