export c2p

This patch fixes the following build error:

<--  snip  -->

..
  Building modules, stage 2.
  MODPOST 1203 modules
ERROR: "c2p" [drivers/video/amifb.ko] undefined!
..
make[2]: *** [__modpost] Error 1

<--  snip  -->
Reported-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/c2p.c

@@ -227,5 +227,6 @@ void c2p(u8 *dst, const u8 *src, u32 dx, u32 dy, u32 width, u32 height,
 	dst += dst_nextline;
     }
 }
+EXPORT_SYMBOL_GPL(c2p);
 
 MODULE_LICENSE("GPL");