core/main: Clean up option handling

- Add a missing space in the usage string
- Drop short option "p", which is unused

src/core/main.c

@@ -35,7 +35,7 @@ int main(int argc, char *argv[]) {
 	const char* output_name = NULL;
 	enum LOGLEVEL loglevel = ERROR;
 
-	static const char* shortopts = "l:o:p:h";
+	static const char* shortopts = "l:o:h";
 	static const struct option longopts[] = {
 		{ "loglevel", required_argument, NULL, 'l' },
 		{ "output", required_argument, NULL, 'o' },