kernel.bbclass: Remove bashism

Fixes build on systems using dash for default shell e.g.

errors like

run.do_strip.25842: [[: not found
| readelf: Error: Unable to read in 0x37 bytes of section headers
| readelf: Error: Not an ELF file - it has the wrong magic bytes at the start

Change-Id: I29cac15be44a02d75a3d6889b6ae9b2e19bf46af
(From OE-Core rev: 6956ffdc6e9879e32360b6ee3a3d286618807485)

(From OE-Core rev: 162996ed5a12786a2a5255ebafa15291bcc328cf)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index fa06c3aae6..70ed95bbe0 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -391,7 +391,7 @@ python split_kernel_packages () {
 
 do_strip() {
         if [ -n "${KERNEL_IMAGE_STRIP_EXTRA_SECTIONS}" ]; then
-                if [[ "${KERNEL_IMAGETYPE}" != "vmlinux" ]]; then
+                if [ "${KERNEL_IMAGETYPE}" != "vmlinux" ]; then
                         bbwarn "image type will not be stripped (not supported): ${KERNEL_IMAGETYPE}"
                         return
                 fi