Use global applet_name instead of local versions.

archival/gunzip.c

@@ -592,7 +592,7 @@ int gunzip_main(int argc, char **argv)
 	char ifname[MAX_PATH_LEN + 1];	/* input file name */
 	char ofname[MAX_PATH_LEN + 1];	/* output file name */
 
-	if (strcmp(*argv, "zcat") == 0) {
+	if (strcmp(applet_name, "zcat") == 0) {
 		to_stdout = 1;
 		if (argc == 1) {
 			fromstdin = 1;