openssh: fix recursive key file removal

The -r option is not required here but should also not hurt,
since it was already tested, that $key is a file.
However, to express the intent of the command more clearly,
let's drop it.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

net/openssh/files/sshd.init

@@ -348,7 +348,7 @@ start_service()
 		[ -f $key ] && {
 			[ -x /usr/bin/ssh-keygen ] && {
 				if ! /usr/bin/ssh-keygen -y -f $key > /dev/null 2>&1; then
-					rm -rf $key
+					rm -f $key
 				fi
 			}
 		}