seqTemplate - fix more shellcheck warnings

seqTemplate.sh

@@ -3,8 +3,8 @@
 readonly toolName=mytool
 
 # Already defined by sequencer.sh, but may be overwritten
-#readonly seq_configName="${sq_scriptName}.cfg"
-#readonly seq_configTemplate="${seq_origin}/${sq_configName}.example"
+#readonly seq_configName="${sq_scriptName:?}.cfg"
+#readonly seq_configTemplate="${seq_origin:?}/${sq_configName:?}.example"
 
 sq_aptOpt=
 sq_config=0
@@ -12,13 +12,13 @@ sq_config=0
 seq_config() {
   ## Called once before executing steps.
   ## e.g. to source a config file manually:
-  #. "${seq_origin}/${seq_configName}"
+  #. "${seq_origin:?}/${seq_configName:?}"
 
   ## or to use sequencer api with profile config file support:
-  #if initSeqConfig -p "${seq_fileName}" "${seq_configTemplate}" ; then
+  #if initSeqConfig -p "${seq_fileName:?}" "${seq_configTemplate:?}" ; then
 
   ## or to use sequencer api with global config file:
-  #if initSeqConfig "${seq_configName}" "${seq_configTemplate}" ; then
+  #if initSeqConfig "${seq_configName:?}" "${seq_configTemplate:?}" ; then
   #  sq_config=1
   #else
   #  # End if no configuration file exists
@@ -47,6 +47,7 @@ step_1() {
   exep "dmesg | head"
 }
 
+# shellcheck disable=SC2034 # Appears unused
 readonly sqr_minVersion=16
 # shellcheck disable=SC1091 # Don't follow this source
 . /usr/local/bin/sequencer.sh