Fix shellcheck errors (includes a bug in setup-user)

Makefile

@@ -17,4 +17,4 @@ deinstall:
 	rm -rf $(SHAREDIR)
 
 shellcheck:
-	find bin/ libexec/ -type f -exec shellcheck "{}" \;
+	find bin/ libexec/ -type f -exec shellcheck -x "{}" \;

bin/portzap

@@ -13,6 +13,7 @@ revfile="${installdir}"/.portzap
 
 ##
 # functions
+# shellcheck source=/dev/null
 . "${libexec}"/functions/print.sh
 
 require_dependency()

bin/setup-portzap

@@ -8,6 +8,7 @@ libexec="${localbase}"/libexec/portzap
 
 ##
 # functions
+# shellcheck source=/dev/null
 . "${libexec}"/functions/print.sh
 
 ##

libexec/portzap/commands/portzap-checkout

@@ -11,6 +11,7 @@ branch=$2
 
 ##
 # functions
+# shellcheck source=/dev/null
 . "${libexec}"/functions/print.sh
 
 ##

libexec/portzap/commands/portzap-clone

@@ -12,6 +12,7 @@ branch=$3
 
 ##
 # functions
+# shellcheck source=/dev/null
 . "${libexec}"/functions/print.sh
 
 ##

libexec/portzap/commands/portzap-install

@@ -13,6 +13,7 @@ revfile=$3
 
 ##
 # functions
+# shellcheck source=/dev/null
 . "${libexec}"/functions/print.sh
 
 perform_update()

libexec/portzap/commands/portzap-pull

@@ -10,6 +10,7 @@ gitdir=$1
 
 ##
 # functions
+# shellcheck source=/dev/null
 . "${libexec}"/functions/print.sh
 
 ##

libexec/portzap/commands/portzap-rm

@@ -10,6 +10,7 @@ installdir=$2
 
 ##
 # functions
+# shellcheck source=/dev/null
 . "${libexec}"/functions/print.sh
 
 erase()

libexec/portzap/setup/setup-doas

@@ -9,6 +9,7 @@ sharedir="${localbase}"/share/portzap
 
 ##
 # functions
+# shellcheck source=/dev/null
 . "${libexec}"/functions/print.sh
 
 ##

libexec/portzap/setup/setup-user

@@ -9,6 +9,7 @@ user="_portzap"
 
 ##
 # functions
+# shellcheck source=/dev/null
 . "${libexec}"/functions/print.sh
 
 ##
@@ -16,7 +17,7 @@ user="_portzap"
 if id -u "${user}" > /dev/null 2>&1; then
    printok "${user} user exists"
 else
-    pw useradd
+    pw useradd \
        -n "${user}" \
        -c "portzap user" \
        -m \