Fix option parsing

Using 'flag' results in duplicate code paths for short and long options.

This broke the -q short option in swaymsg, because there was:

 {"quiet", no_argument, &quiet, 'q'}

Which will set quiet to 'q' and return 0, not 'q'.

sway/main.c

@@ -57,10 +57,10 @@ int main(int argc, char **argv) {
 	static struct option long_options[] = {
 		{"help", no_argument, NULL, 'h'},
 		{"config", required_argument, NULL, 'c'},
-		{"validate", no_argument, &validate, 1},
+		{"validate", no_argument, NULL, 'C'},
-		{"debug", no_argument, &debug, 1},
+		{"debug", no_argument, NULL, 'd'},
 		{"version", no_argument, NULL, 'v'},
-		{"verbose", no_argument, &verbose, 1},
+		{"verbose", no_argument, NULL, 'V'},
 		{"get-socketpath", no_argument, NULL, 'p'},
 		{0, 0, 0, 0}
 	};
@@ -87,8 +87,6 @@ int main(int argc, char **argv) {
 			break;
 		}
 		switch (c) {
-		case 0: // Flag
-			break;
 		case 'h': // help
 			fprintf(stdout, "%s", usage);
 			exit(EXIT_SUCCESS);

swaygrab/main.c

@@ -128,10 +128,10 @@ int main(int argc, char **argv) {
 
 	static struct option long_options[] = {
 		{"help", no_argument, NULL, 'h'},
-		{"capture", no_argument, &capture, 'c'},
+		{"capture", no_argument, NULL, 'c'},
 		{"version", no_argument, NULL, 'v'},
 		{"socket", required_argument, NULL, 's'},
-		{"raw", no_argument, &raw, 'r'},
+		{"raw", no_argument, NULL, 'r'},
 		{"rate", required_argument, NULL, 'R'},
 		{0, 0, 0, 0}
 	};
@@ -154,8 +154,6 @@ int main(int argc, char **argv) {
 			break;
 		}
 		switch (c) {
-		case 0: // Flag
-			break;
 		case 's': // Socket
 			socket_path = strdup(optarg);
 			break;

swaymsg/main.c

@@ -24,7 +24,7 @@ int main(int argc, char **argv) {
 
 	static struct option long_options[] = {
 		{"help", no_argument, NULL, 'h'},
-		{"quiet", no_argument, &quiet, 'q'},
+		{"quiet", no_argument, NULL, 'q'},
 		{"version", no_argument, NULL, 'v'},
 		{"socket", required_argument, NULL, 's'},
 		{"type", required_argument, NULL, 't'},
@@ -48,7 +48,8 @@ int main(int argc, char **argv) {
 			break;
 		}
 		switch (c) {
-		case 0: // Flag
+		case 'q': // Quiet
+			quiet = 1;
 			break;
 		case 's': // Socket
 			socket_path = strdup(optarg);