Check status of command, not exit-code, in default_server_san()

Signed-off-by: Richard T Bonhomme <tincantech@protonmail.com>

easyrsa3/easyrsa

@@ -1991,10 +1991,8 @@ default_server_san() {
 		easyrsa_openssl req -in "$path" -noout -subject -nameopt sep_multiline |
 		awk -F'=' '/^  *CN=/{print $2}'
 		)
-	echo "$cn" | grep -E -q '^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$'
-	# Check exit code directly with e.g. if mycmd;, not indirectly with $?.
-	# shellcheck disable=SC2181
-	if [ $? -eq 0 ]; then
+
+	if echo "$cn" | grep -E -q '^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$'; then
 		print "subjectAltName = IP:$cn"
 	else
 		print "subjectAltName = DNS:$cn"