Fix quoting bug introduced by commit 74de7aef

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/common/cmd_net.c b/common/cmd_net.c
index 9bef7a2..92bbf85 100644
--- a/common/cmd_net.c
+++ b/common/cmd_net.c
@@ -224,7 +224,7 @@
 
 #ifdef CONFIG_SOURCE
 	if (((s = getenv("autoscript")) != NULL) && (strcmp(s,"yes") == 0)) {
-		printf ("Running "source" command at addr 0x%08lX",
+		printf ("Running \"source\" command at addr 0x%08lX",
 			load_addr);
 
 		s = getenv ("autoscript_uname");