build: find_md5: ignore non-existent files or directories
authorYousong Zhou <yszhou4tech@gmail.com>
Thu, 24 Nov 2016 05:50:02 +0000 (13:50 +0800)
committerFelix Fietkau <nbd@nbd.name>
Thu, 24 Nov 2016 11:53:19 +0000 (12:53 +0100)
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>

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