Create tmpfs mount only if modules tarball is present

crypt-initrd-extra-files/init

@@ -337,9 +337,11 @@ unset fsckfix
 mount -n -o move /sys ${rootmnt}/sys
 mount -n -o move /proc ${rootmnt}/proc
 
-mount -t tmpfs -o size=100M,mode=0700 modules ${rootmnt}/lib/modules/
-cd ${rootmnt}/lib/modules/
-tar xfz /modules.tgz
+if [ -e /modules.tgz ]; then
+    mount -t tmpfs -o size=100M,mode=0700 modules ${rootmnt}/lib/modules/
+    cd ${rootmnt}/lib/modules/
+    tar xfz /modules.tgz
+fi
 
 # Chain to real filesystem
 if [ -z "$drop_caps" ] && command -v switch_root >/dev/null 2>&1; then