hush: fix hush -c 'echo $0' - was showing empty string

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/hush.c

@@ -7093,6 +7093,7 @@ int hush_main(int argc, char **argv)
 				/* -c 'script' (no params): prevent empty $0 */
 				G.global_argv--; /* points to argv[i] of 'script' */
 				G.global_argv[0] = argv[0];
+				G.global_argc++;
 			} /* else -c 'script' ARG0 [ARG1...]: $0 is ARG0 */
 			init_sigmasks();
 			parse_and_run_string(optarg);