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/designware.c b/drivers/net/designware.c
index 0fccbc0..68b6548 100644
--- a/drivers/net/designware.c
+++ b/drivers/net/designware.c
@@ -81,7 +81,7 @@
 
 	bus->read = dw_mdio_read;
 	bus->write = dw_mdio_write;
-	snprintf(bus->name, sizeof(bus->name), name);
+	snprintf(bus->name, sizeof(bus->name), "%s", name);
 
 	bus->priv = (void *)mac_regs_p;