save 10 bytes on strings

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/wget.c b/networking/wget.c
index 8028f12..74d9004 100644
--- a/networking/wget.c
+++ b/networking/wget.c
@@ -192,7 +192,7 @@
 	/* hopefully it understands what ESPIPE means... */
 	fp = fdopen(xconnect_stream(lsa), "r+");
 	if (fp == NULL)
-		bb_perror_msg_and_die("fdopen");
+		bb_perror_msg_and_die(bb_msg_memory_exhausted);
 
 	return fp;
 }