memstick: change to new flag variable

The EXTRA_CFLAGS assignment in memstick/Makefile was not accomplishing
anything because this flag only has effect on sources at the same level
as the makefile (i.e., per directory). Since both core/ and host/ rely
on MEMSTICK_DEBUG, the subdir-ccflags-y variant seems to be the
appropriate choice.

Signed-off-by: matt mooney <[e-mail]>
Acked-by: WANG Cong <[e-mail]>
Signed-off-by: Michal Marek <[e-mail]>

drivers/memstick/Makefile

···
 # Makefile for the kernel MemoryStick device drivers.
 #
 
-ifeq ($(CONFIG_MEMSTICK_DEBUG),y)
-	EXTRA_CFLAGS		+= -DDEBUG
-endif
+subdir-ccflags-$(CONFIG_MEMSTICK_DEBUG) := -DDEBUG
 
 obj-$(CONFIG_MEMSTICK)		+= core/
 obj-$(CONFIG_MEMSTICK)		+= host/

drivers/memstick/core/Makefile

···
 # Makefile for the kernel MemoryStick core.
 #
 
-ifeq ($(CONFIG_MEMSTICK_DEBUG),y)
-	EXTRA_CFLAGS		+= -DDEBUG
-endif
-
 obj-$(CONFIG_MEMSTICK)		+= memstick.o
 
 obj-$(CONFIG_MSPRO_BLOCK)	+= mspro_block.o

drivers/memstick/host/Makefile

···
 # Makefile for MemoryStick host controller drivers
 #
 
-ifeq ($(CONFIG_MEMSTICK_DEBUG),y)
-	EXTRA_CFLAGS			+= -DDEBUG
-endif
-
 obj-$(CONFIG_MEMSTICK_TIFM_MS)		+= tifm_ms.o
 obj-$(CONFIG_MEMSTICK_JMICRON_38X)	+= jmb38x_ms.o