Use EINVALID_OPTION for parse failures

Again, to consolidate usage of custom error codes, EINVALID_OPTION is
always used for command-line option parsing failure.

Signed-off-by: Patrick McCarty <patrick.mccarty@intel.com>

src/check_update.c

@@ -162,7 +162,7 @@ int check_update_main(int argc, char **argv)
 	copyright_header("software update checker");
 
 	if (!parse_options(argc, argv)) {
-		return EXIT_FAILURE;
+		return EINVALID_OPTION;
 	}
 
 	ret = check_update();

src/clr_bundle_add.c

@@ -167,7 +167,7 @@ int bundle_add_main(int argc, char **argv)
 	copyright_header("bundle adder");
 
 	if (!parse_options(argc, argv)) {
-		return EXIT_FAILURE;
+		return EINVALID_OPTION;
 	}
 
 	if (list) {

src/main.c

@@ -208,7 +208,7 @@ int update_main(int argc, char **argv)
 	copyright_header("software update");
 
 	if (!parse_options(argc, argv)) {
-		return EXIT_FAILURE;
+		return EINVALID_OPTION;
 	}
 
 	if (cmd_line_status) {

src/search.c

@@ -486,7 +486,7 @@ int search_main(int argc, char **argv)
 	struct list *subs = NULL;
 
 	if (!parse_options(argc, argv)) {
-		return EXIT_FAILURE;
+		return EINVALID_OPTION;
 	}
 
 	ret = swupd_init(&lock_fd);

src/swupd.c

@@ -140,7 +140,7 @@ int main(int argc, char **argv)
 	int ret;
 
 	if (parse_options(argc, argv, &index) < 0) {
-		return EXIT_FAILURE;
+		return EINVALID_OPTION;
 	}
 
 	/* Reset optind to 0 (instead of the default value, 1) at this point,

src/verify.c

@@ -596,7 +596,7 @@ int verify_main(int argc, char **argv)
 	copyright_header("software verify");
 
 	if (!parse_options(argc, argv)) {
-		return EXIT_FAILURE;
+		return EINVALID_OPTION;
 	}
 
 	/* parse command line options */