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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>