cmd_sf: Add print mesg for 'sf erase' command

This patch adds a print messages while using 'sf erase' command
to make sure that how many bytes erased in flash device.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Acked-by: Tom Rini <trini@ti.com>
diff --git a/common/cmd_sf.c b/common/cmd_sf.c
index 0a17782..7f12a49 100644
--- a/common/cmd_sf.c
+++ b/common/cmd_sf.c
@@ -305,12 +305,10 @@
 	}
 
 	ret = spi_flash_erase(flash, offset, len);
-	if (ret) {
-		printf("SPI flash %s failed\n", argv[0]);
-		return 1;
-	}
+	printf("SF: %zu bytes @ %#x Erased: %s\n", (size_t)len, (u32)offset,
+			ret ? "ERROR" : "OK");
 
-	return 0;
+	return ret == 0 ? 0 : 1;
 }
 
 #ifdef CONFIG_CMD_SF_TEST