[PATCH] zram: include linux/err.h

[Arnd Bergmann]

The zram driver uses the ERR_PTR macro defined in <linux/err.h>
and relies on this header to be included implicitly through
other headers, which is not (always) the case on the ARM architecture.

Adding an explicit #include allows us to build the driver in
all configurations.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
index 92a83df..3507bef 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -7,6 +7,7 @@
  * 2 of the License, or (at your option) any later version.
  */
 
+#include <linux/err.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/slab.h>
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