detect-virt: continue parsing after --cvm

--cvm is a mode switch, so it must not stop option parsing.
Keep parsing after it to honor later options and validate arguments.

Before: --cvm --quiet printed none; --cvm unexpected-argument printed none.
After: --cvm --quiet prints nothing; extra arguments are rejected.

Follow-up for: 5e0c61f64d

src/detect-virt/detect-virt.c

@@ -88,7 +88,7 @@ static int parse_argv(int argc, char *argv[]) {
 
                 OPTION_LONG("cvm", NULL, "Only detect whether we are run in a confidential VM"):
                         arg_mode = ONLY_CVM;
-                        return 1;
+                        break;
 
                 OPTION_LONG("list-cvm", NULL, "List all known and detectable types of confidential virtualization"):
                         return DUMP_STRING_TABLE(confidential_virtualization, ConfidentialVirtualization, _CONFIDENTIAL_VIRTUALIZATION_MAX);