Merge pull request torvalds#126 from liuyuan10/extern

lkl: Mark lkl_virtio_devs as extern in lkl_host.h

Author: Octavian Purdila

tools/lkl/include/lkl_host.h

@@ -17,7 +17,7 @@ extern struct lkl_host_operations lkl_host_ops;
  */
 int lkl_printf(const char *fmt, ...);
 
-char lkl_virtio_devs[256];
+extern char lkl_virtio_devs[256];
 
 struct lkl_dev_buf {
 	void *addr;