tree: address latest ShellCheck errors

We're now using ShellCheck from f38 which detected new issues.

src/cmd-build

@@ -110,7 +110,6 @@ while true; do
             ;;
         -*)
             fatal "$0: unrecognized option: $1"
-            exit 1
             ;;
         *)
             break

src/cmd-build-fast

@@ -47,7 +47,6 @@ while true; do
             ;;
         -*)
             fatal "$0: unrecognized option: $1"
-            exit 1
             ;;
         *)
             break

src/cmd-buildextend-metal

@@ -73,7 +73,6 @@ while true; do
             ;;
         -*)
             fatal "$0: unrecognized option: $1"
-            exit 1
             ;;
         *)
             break

src/cmd-fetch

@@ -86,7 +86,6 @@ while true; do
             ;;
         *)
             fatal "$0: unrecognized option: $1"
-            exit 1
             ;;
     esac
     shift
@@ -95,7 +94,6 @@ done
 if [ $# -ne 0 ]; then
     print_help
     fatal "ERROR: Too many arguments"
-    exit 1
 fi
 
 prepare_build

src/cmd-init

@@ -125,7 +125,6 @@ while true; do
     *)
         print_help
         fatal "init: unrecognized option: $1"
-        exit 1
         ;;
     esac
     shift
@@ -135,7 +134,6 @@ done
 if [ $# -ne 1 ]; then
     print_help
     fatal "ERROR: Missing GITCONFIG"
-    exit 1
 fi
 
 # If the current working dir is not empty then error out

src/cmd-offline-update

@@ -57,7 +57,6 @@ while true; do
             ;;
         -*)
             fatal "$0: unrecognized option: $1"
-            exit 1
             ;;
         *)
             break

src/create_disk.sh

@@ -533,9 +533,9 @@ chattr +i $rootfs
 fstrim -a -v
 # Ensure the filesystem journals are flushed
 for fs in $rootfs/boot $rootfs; do
-    mount -o remount,ro $fs
-    xfs_freeze -f $fs
-    xfs_freeze -u $fs
+    mount -o remount,ro "$fs"
+    xfs_freeze -f "$fs"
+    xfs_freeze -u "$fs"
 done
 
 umount -R $rootfs