mule: mule.sh: use printf instead of echo with flags

Hinted by Shellcheck:
SC3037: In POSIX sh, echo flags are undefined.

Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/mule/mule.sh b/mule/mule.sh
index 0245f5a..6b1dfb4 100755
--- a/mule/mule.sh
+++ b/mule/mule.sh
@@ -107,9 +107,9 @@ case "$1" in
 		while ! lsusb -d 0483:df11 > /dev/null
 		do
 			sleep .1
-			echo -n .
+			printf .
 		done
-		echo -e "\nfound"
+		printf "\nfound"
 	else
 		sleep 5
 	fi