[SPARC64]: Fix enable_dma() in asm-sparc64/parport.h

Call ebus_dma_enable() before calling ebus_dma_request(), otherwise
ebus_dma_request() returns -EINVAL and enable_dma() calls BUG()...
Signed-off-by: David S. Miller <davem@davemloft.net>

include/asm-sparc64/parport.h

@@ -27,12 +27,12 @@ static struct sparc_ebus_info {
 
 static __inline__ void enable_dma(unsigned int dmanr)
 {
+	ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
+
 	if (ebus_dma_request(&sparc_ebus_dmas[dmanr].info,
 			     sparc_ebus_dmas[dmanr].addr,
 			     sparc_ebus_dmas[dmanr].count))
 		BUG();
-
-	ebus_dma_enable(&sparc_ebus_dmas[dmanr].info, 1);
 }
 
 static __inline__ void disable_dma(unsigned int dmanr)