Revert "Fix unused{,-but-set}-variable compiler warnings."

This reverts commit dde9f29a8ef94c72f83a1e4881158dc537d24fce.

The commit introduced the following compiler error:

[100/255] Compiling posix/JackNetUnixSocket.cpp
../posix/JackNetUnixSocket.cpp: In member function 'int Jack::JackNetUnixSocket::NewSocket()':
../posix/JackNetUnixSocket.cpp:126:32: error: 'tos' was not declared in this scope
         socklen_t len = sizeof(tos);

2 files changed, 7 insertions, 0 deletions

diff --git a/example-clients/metro.c b/example-clients/metro.c
index 065d03e4..8240b40c 100644
--- a/example-clients/metro.c
+++ b/example-clients/metro.c
@@ -135,6 +135,7 @@ main (int argc, char *argv[])
 	int attack_percent = 1, decay_percent = 10, dur_arg = 100;
 	char *client_name = 0;
 	char *bpm_string = "bpm";
+	int verbose = 0;
 	jack_status_t status;
 
 	const char *options = "f:A:D:a:d:b:n:thv";
@@ -149,6 +150,7 @@ main (int argc, char *argv[])
 		{"name", 1, 0, 'n'},
 		{"transport", 0, 0, 't'},
 		{"help", 0, 0, 'h'},
+		{"verbose", 0, 0, 'v'},
 		{0, 0, 0, 0}
 	};
 
@@ -196,6 +198,9 @@ main (int argc, char *argv[])
 			client_name = (char *) malloc ((strlen (optarg) + 1) * sizeof (char));
 			strcpy (client_name, optarg);
 			break;
+		case 'v':
+			verbose = 1;
+			break;
 		case 't':
 			transport_aware = 1;
 			break;
diff --git a/example-clients/midiseq.c b/example-clients/midiseq.c
index 867942f5..45085e80 100644
--- a/example-clients/midiseq.c
+++ b/example-clients/midiseq.c
@@ -82,6 +82,7 @@ static int process(jack_nframes_t nframes, void *arg)
 int main(int narg, char **args)
 {
 	int i;
+	jack_nframes_t nframes;
 	if ((narg<6) || ((narg-3)%3 != 0)) {
 		usage();
 		exit(1);
@@ -92,6 +93,7 @@ int main(int narg, char **args)
 	}
 	jack_set_process_callback (client, process, 0);
 	output_port = jack_port_register (client, "out", JACK_DEFAULT_MIDI_TYPE, JackPortIsOutput, 0);
+	nframes = jack_get_buffer_size(client);
 	loop_index = 0;
 	num_notes = (narg - 3)/3;
 	note_frqs = malloc(num_notes*sizeof(unsigned char));