msvcrt: fix potential memory leak (found by Smatch)

[Lionel_Debroux]

_wgetcwd leaks some heap memory in an error paths. Found in Michael
Stefaniuc's list of Wine potential bugs detected by Smatch.
Fixed by mirroring the "else if" already present in _getcwd. This "else"
is correct because the condition of this test evaluates to false if
there was a memory allocation (due to if (size <= dir_len) size =
dir_len + 1; assignment).

2007-09-24  Lionel Debroux <lionel_debroux at yahoo.fr>
       * dlls/msvcrt/dir.c:
       msvcrt: fix potential memory leak (found by Smatch).
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