staging: easycap needs smp_lock.h, fixes build error

Add header file to fix build error:

drivers/staging/easycap/easycap_main.c:4251: error: implicit declaration of function 'lock_kernel'
drivers/staging/easycap/easycap_main.c:4254: error: implicit declaration of function 'unlock_kernel'

Signed-off-by: Randy Dunlap <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/easycap/easycap.h

···
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/module.h>
 #include <linux/kref.h>
 #include <linux/usb.h>