Move uninitialized_var() macro from ubi_uboot.h to compiler.h

This is needed so that we could use this macro for non-UBI code.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>

include/compiler.h

diff --git a/include/compiler.h b/include/compiler.h
index 272fd3c..e602cce 100644
--- a/include/compiler.h
+++ b/include/compiler.h
@@ -122,4 +122,7 @@
 
 #endif
 
+/* compiler options */
+#define uninitialized_var(x)		x = x
+
 #endif

include/ubi_uboot.h

diff --git a/include/ubi_uboot.h b/include/ubi_uboot.h
index 74312ab..60f6a5f 100644
--- a/include/ubi_uboot.h
+++ b/include/ubi_uboot.h
@@ -15,6 +15,7 @@
 #define __UBOOT_UBI_H
 
 #include <common.h>
+#include <compiler.h>
 #include <malloc.h>
 #include <div64.h>
 #include <linux/crc32.h>
@@ -51,9 +52,6 @@
 #undef CONFIG_MTD_UBI_DEBUG_MSG_BLD
 #define CONFIG_MTD_UBI_DEBUG_DISABLE_BGT
 
-/* compiler options */
-#define uninitialized_var(x)		x = x
-
 /* build.c */
 #define get_device(...)
 #define put_device(...)