kubernetes: update sed expression

It misses a backslash in sed expression and causes warning when
run do_compile:

| sed: -e expression #1, char 35: Unmatched ) or \)

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/recipes-containers/kubernetes/kubernetes_git.bb b/recipes-containers/kubernetes/kubernetes_git.bb
index e165ebe5..1ba52b65 100644
--- a/recipes-containers/kubernetes/kubernetes_git.bb
+++ b/recipes-containers/kubernetes/kubernetes_git.bb
@@ -50,7 +50,7 @@ do_compile() {
         export CGO_CFLAGS="${BUILD_CFLAGS}"
         # as of go 1.15.5, there are some flags the CGO doesn't like. Rather than
         # clearing them all, we sed away the ones we don't want.
-        export CGO_LDFLAGS="$(echo ${BUILD_LDFLAGS} | sed 's/-Wl,-O1//g' | sed 's/-Wl,--dynamic-linker.*?( \|$\)//g')"
+        export CGO_LDFLAGS="$(echo ${BUILD_LDFLAGS} | sed 's/-Wl,-O1//g' | sed 's/-Wl,--dynamic-linker.*?\( \|$\)//g')"
         export CC="${BUILD_CC}"
         export LD="${BUILD_LD}"