ARM: S3C64XX: Tidy definition and comments in s3c_dma_has_circular()

The recent changes to arch/arm/mach-s3c6400/include/mach/dma.h have
left an out of date comment in there as well as accidentally changing
the type of the function.

Fix the commit 54489cd4Signed-off-by: Ben Dooks <ben-linux@fluff.org>

arch/arm/mach-s3c6400/include/mach/dma.h

@@ -58,12 +58,9 @@ enum dma_ch {
 	DMACH_MAX		/* the end */
 };
 
-static __inline__ int s3c_dma_has_circular(void)
+static __inline__ bool s3c_dma_has_circular(void)
 {
-	/* we will be supporting ciruclar buffers as soon as we have DMA
-	 * engine support.
-	 */
-	return 1;
+	return true;
 }
 
 #define S3C2410_DMAF_CIRCULAR		(1 << 0)