cmd: Make allocation unfailable

[Jacek Caban]

cmd was quite inconsistent about its OOM error handling. Also fixes heap
corruption that was the original reason I looked at this.

---
 programs/cmd/batch.c     |    5 +-
 programs/cmd/builtins.c  |   43 ++++++-----------
 programs/cmd/directory.c |   31 ++++--------
 programs/cmd/wcmd.h      |   18 +++++++-
 programs/cmd/wcmdmain.c  |  116
++++++++++++++++++++--------------------------
 5 files changed, 96 insertions(+), 117 deletions(-)


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