container: include stdbool.h

Fixes following compile issue :

container.h:18:15: error: unknown type name 'bool'
 static inline bool is_container() {
               ^~~~
make[5]: *** [CMakeFiles/init.dir/build.make:154: CMakeFiles/init.dir/initd/zram.c.o] Error 1

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/container.h b/container.h
index 7fb0768..d33fa32 100644
--- a/container.h
+++ b/container.h
@@ -13,7 +13,9 @@
 
 #ifndef __CONTAINER_H
 #define __CONTAINER_H
+
 #include <stdlib.h>
+#include <stdbool.h>
 
 static inline bool is_container() {
 	return !!getenv("container");