drivers/staging/dt3155v4l/dt3155v4l.c needs slab.h

alpha allmodconfig:

drivers/staging/dt3155v4l/dt3155v4l.c:434: error: implicit declaration of function 'kzalloc'
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/dt3155v4l/dt3155v4l.c

@@ -22,6 +22,7 @@
 #include <linux/stringify.h>
 #include <linux/delay.h>
 #include <linux/kthread.h>
+#include <linux/slab.h>
 #include <media/v4l2-dev.h>
 #include <media/v4l2-ioctl.h>
 #include <media/videobuf2-dma-contig.h>