wifi: cfg80211: fix certs build to not depend on file order

The file for the new certificate (Chen-Yu Tsai's) didn't
end with a comma, so depending on the file order in the
build rule, we'd end up with invalid C when concatenating
the (now two) certificates. Fix that.

Cc: [e-mail]
Reported-by: Biju Das <[e-mail]>
Reported-by: Naresh Kamboju <[e-mail]>
Fixes: fb768d3b13ff ("wifi: cfg80211: Add my certificate")
Signed-off-by: Johannes Berg <[e-mail]>

net/wireless/certs/wens.hex

···
 0xf0, 0xc7, 0x83, 0xbb, 0xa2, 0x81, 0x03, 0x2d,
 0xd4, 0x2a, 0x63, 0x3f, 0xf7, 0x31, 0x2e, 0x40,
 0x33, 0x5c, 0x46, 0xbc, 0x9b, 0xc1, 0x05, 0xa5,
-0x45, 0x4e, 0xc3
+0x45, 0x4e, 0xc3,