msvcrt: move error condition before memory allocation (found by Smatch).

[Lionel_Debroux]

_fullpath leaks some heap memory in an error paths. Found in Michael
Stefaniuc's list of Wine potential bugs detected by Smatch.
Fixed by moving the error treatment before the allocation, since the
error treatment doesn't fire up if there was a memory allocation (due to
size = MAX_PATH; assignment).

2007-09-24  Lionel Debroux <lionel_debroux at yahoo.fr>
       * dlls/msvcrt/dir.c:
       msvcrt: move error condition before memory allocation (found by
Smatch).

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