nfsrootfs: disable warning message if bootargs root parameter have not been defined

we have case that don't define root in bootargs,
if [ ${bootparam_root} != "/dev/nfs" ] will output warning "/init.d/85-nfsrootfs: line 4: [: !=: unary operator expected"
let variable expension result become string to solve this problem

(From OE-Core rev: d50e12e5ae6a72535cacd0f767b1be1f89278f79)

Signed-off-by: Jimmy Ho <jimmy.ho@sifive.com>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/meta/recipes-core/initrdscripts/initramfs-framework/nfsrootfs b/meta/recipes-core/initrdscripts/initramfs-framework/nfsrootfs
index e67ee4c25d..30555aef55 100644
--- a/meta/recipes-core/initrdscripts/initramfs-framework/nfsrootfs
+++ b/meta/recipes-core/initrdscripts/initramfs-framework/nfsrootfs
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 nfsrootfs_enabled() {
-        if [ ${bootparam_root} != "/dev/nfs" ] || [ -z ${bootparam_nfsroot} ]; then
+        if [ "${bootparam_root}" != "/dev/nfs" ] || [ -z ${bootparam_nfsroot} ]; then
                 return 1
         fi
         return 0