GenWQE: Fix compile problems for Alpha

The header which contained the declaration for kcalloc() was not
inlcuded.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Frank Haverkamp <haver@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/genwqe/card_base.h b/drivers/misc/genwqe/card_base.h
index 41953e3..5e4dbd2 100644
--- a/drivers/misc/genwqe/card_base.h
+++ b/drivers/misc/genwqe/card_base.h
@@ -36,6 +36,7 @@
 #include <linux/io.h>
 #include <linux/version.h>
 #include <linux/debugfs.h>
+#include <linux/slab.h>
 
 #include <linux/genwqe/genwqe_card.h>
 #include "genwqe_driver.h"