Replace index_in_[sub]str_array with index_in_[sub]strings,
which scans thru "abc\0def\0123\0\0" type strings. Saves 250 bytes.

   text    data     bss     dec     hex filename
 781266    1328   11844  794438   c1f46 busybox_old
 781010    1328   11844  794182   c1e46 busybox_unstripped

diff --git a/networking/ftpgetput.c b/networking/ftpgetput.c
index 011fbac..02e7c52 100644
--- a/networking/ftpgetput.c
+++ b/networking/ftpgetput.c
@@ -293,7 +293,7 @@
 	"username\0" Required_argument "u"
 	"password\0" Required_argument "p"
 	"port\0"     Required_argument "P"
-	"\0";
+	;
 #endif
 
 int ftpgetput_main(int argc, char **argv);