Fix GCC format-security errors and convert sprintfs.

With format-security errors turned on, GCC picks up the use of sprintf with
a format parameter not being a string literal.

Simple uses of sprintf are also converted to use strcpy.

Signed-off-by: Ben Whitten <ben.whitten@gmail.com>
Acked-by: Wolfgang Denk <wd@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
index 0444795..92c3dca 100644
--- a/drivers/net/davinci_emac.c
+++ b/drivers/net/davinci_emac.c
@@ -777,7 +777,7 @@
 		return -1;
 
 	memset(dev, 0, sizeof *dev);
-	sprintf(dev->name, "DaVinci-EMAC");
+	strcpy(dev->name, "DaVinci-EMAC");
 
 	dev->iobase = 0;
 	dev->init = davinci_eth_open;