runqemu minor fixes

index 9fdbd54..84674e2 100755
@@ -98,7 +98,7 @@ while true; do
             [ -z "$MACHINE" ] && MACHINE=$arg || \
                 error "conflicting MACHINE types [$MACHINE] and [$arg]"
             ;;
-        "ext2" | "ext3" | "jffs2" | "nfs" | "btrfs")
+        "ext2" | "ext3" | "ext4" | "jffs2" | "nfs" | "btrfs")
             [ -z "$FSTYPE" -o "$FSTYPE" = "$arg" ] && FSTYPE=$arg || \
                 error "conflicting FSTYPE types [$FSTYPE] and [$arg]"
             ;;

index 84674e2..8d149a2 100755
@@ -25,7 +25,7 @@ usage() {
     echo "  QEMUARCH - the qemu machine architecture to use"
     echo "  KERNEL - the kernel image file to use"
     echo "  ROOTFS - the rootfs image file or nfsroot directory to use"
-    echo "  MACHINE=xyz - the machine name (optional, autodetected from KERNEL filename if unspecified)"
+    echo "  MACHINE - the machine name (optional, autodetected from KERNEL filename if unspecified)"
     echo "  Simplified QEMU command-line options can be passed with:"
     echo "    nographic - disables video console"
     echo "    serial - enables a serial console on /dev/ttyS0"