mtdchar build fix

sh:

drivers/mtd/mtdchar.c: In function `mtd_mmap':
drivers/mtd/mtdchar.c:817: error: dereferencing pointer to incomplete type
drivers/mtd/mtdchar.c:817: error: `VM_SHARED' undeclared (first use in this function)
drivers/mtd/mtdchar.c:817: error: (Each undeclared identifier is reported only once

Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/mtd/mtdchar.c

@@ -7,6 +7,7 @@
 
 #include <linux/device.h>
 #include <linux/fs.h>
+#include <linux/mm.h>
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/kernel.h>