find: add zeroing of G.xxx; ftpd - remove extraneous zeroing of G.xxx

Brought "G trick" to the same shape in a few more places.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/networking/ftpd.c b/networking/ftpd.c
index a8687fb..70a3533 100644
--- a/networking/ftpd.c
+++ b/networking/ftpd.c
@@ -662,7 +662,7 @@
 		execv(bb_busybox_exec_path + 1, (char**) argv);
 		_exit(127);
 #else
-		memset(&G, 0, sizeof(G));
+		/* memset(&G, 0, sizeof(G)); - ls_main does it */
 		exit(ls_main(ARRAY_SIZE(argv) - 1, (char**) argv));
 #endif
 	}
@@ -1114,7 +1114,7 @@
 /* --group-directories-first would be nice, but ls don't do that yet */
 		xchdir(argv[2]);
 		argv[2] = (char*)"--";
-		memset(&G, 0, sizeof(G));
+		/* memset(&G, 0, sizeof(G)); - ls_main does it */
 		return ls_main(argc, argv);
 	}
 #endif
diff --git a/networking/telnet.c b/networking/telnet.c
index cc99425..77e1747 100644
--- a/networking/telnet.c
+++ b/networking/telnet.c
@@ -77,11 +77,10 @@
 	struct termios termios_raw;
 };
 #define G (*(struct globals*)&bb_common_bufsiz1)
-void BUG_telnet_globals_too_big(void);
 #define INIT_G() do { \
-	if (sizeof(G) > COMMON_BUFSIZE) \
-		BUG_telnet_globals_too_big(); \
-	/* memset(&G, 0, sizeof G); - already is */ \
+	struct G_sizecheck { \
+		char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \
+	}; \
 } while (0)
 
 /* Function prototypes */