Fix for previous commit

bundle/bundle-linux.sh

@@ -68,10 +68,13 @@ elif [[ "${KERNEL_NAME}" == "MINGW"* ]]; then
     echo "ERROR: On Windows MSVC_ARCH is to be set to either x86 or x64."
     exit 1
   fi
-  if [ "${MSVC_ARCH}" == "x86" ]; then
+  if [ "${MSVC_ARCH}" == "x64" ]; then
     BITNESS="64"
   elif [ "${MSVC_ARCH}" == "x86" ]; then
     BITNESS="32"
+  else
+    echo "ERROR: Unkown MSVC architecture ${MSVC_ARCH}"
+    exit 1
   fi
   # TODO(sergey): Detect MSVC install somehow.
   "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" "${MSVC_ARCH}"