Yousong Zhou f66cb6f810 build: find_md5: ignore non-existent files or directories
Targets like malta can have no patches/ directory available and this
commit tries quash "no such file or directory" messages from `find`

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
2016-11-24 12:53:19 +01:00
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