scripts: Fix instll-toolchain script typo

Change-Id: Ic6efd01b7aee6f344799c2c2cd72be7e0b8874ae

install-toolchain.sh

diff --git a/install-toolchain.sh b/install-toolchain.sh
index 314f2a8..72efcb7 100755
--- a/install-toolchain.sh
+++ b/install-toolchain.sh
@@ -80,7 +80,7 @@
   pushd "${DOWNLOAD_DIR}" > /dev/null
   # tarball may be timestamped during build. Update the filename in sha256sum
   # file to check.
-  sed -i -e "s,_[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}.tar.gz,.tar.gz," ${TOOLCHAIN_TARBALL}.sha256sum"
+  sed -i -e "s,_[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}.tar.gz,.tar.gz," "${TOOLCHAIN_TARBALL}.sha256sum"
   try sha256sum -c "${TOOLCHAIN_TARBALL}.sha256sum"
   popd > /dev/null
 fi