[source] build: find_md5: ignore non-existent files or directories

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/f66cb6f810e55016167086bd96310fc14c1e6362

commit f66cb6f810e55016167086bd96310fc14c1e6362
Author: Yousong Zhou <yszhou4tech at gmail.com>
AuthorDate: Thu Nov 24 13:50:02 2016 +0800

    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 at gmail.com>
---
 include/depends.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/depends.mk b/include/depends.mk
index 53e5b1e..7135e52 100644
--- a/include/depends.mk
+++ b/include/depends.mk
@@ -13,7 +13,7 @@
 
 DEP_FINDPARAMS := -x "*/.svn*" -x ".*" -x "*:*" -x "*\!*" -x "* *" -x "*\\\#*" -x "*/.*_check" -x "*/.*.swp"
 
-find_md5=$(SH_FUNC) find $(1) -type f $(patsubst -x,-and -not -path,$(DEP_FINDPARAMS) $(2)) | md5s
+find_md5=$(SH_FUNC) find $(wildcard $(1)) -type f $(patsubst -x,-and -not -path,$(DEP_FINDPARAMS) $(2)) | md5s
 
 define rdep
   .PRECIOUS: $(2)