[PATCH 4.19 72/79] wireless: Skip directory when generating certificates

[Greg Kroah-Hartman]

From: Maxim Mikityanskiy <maxtram95@xxxxxxxxx>

[ Upstream commit 32b5a2c9950b9284000059d752f7afa164deb15e ]

Commit 715a12334764 ("wireless: don't write C files on failures") drops
the `test -f $$f` check. The list of targets contains the
CONFIG_CFG80211_EXTRA_REGDB_KEYDIR directory itself, and this check used
to filter it out. After the check was removed, the extra keydir option
no longer works, failing with the following message:

od: 'standard input': read error: Is a directory

This commit restores the check to make extra keydir work again.

Fixes: 715a12334764 ("wireless: don't write C files on failures")
Signed-off-by: Maxim Mikityanskiy <maxtram95@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/wireless/Makefile |    1 +
 1 file changed, 1 insertion(+)

--- a/net/wireless/Makefile
+++ b/net/wireless/Makefile
@@ -38,6 +38,7 @@ $(obj)/extra-certs.c: $(CONFIG_CFG80211_
 	@(set -e; \
 	  allf=""; \
 	  for f in $^ ; do \
+	      test -f $$f || continue;\
 	      # similar to hexdump -v -e '1/1 "0x%.2x," "\n"' \
 	      thisf=$$(od -An -v -tx1 < $$f | \
 	                   sed -e 's/ /\n/g' | \