[xmp] Fix mixer pan setting option

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>

src/main.c

@@ -164,6 +164,7 @@ int main(int argc, char **argv)
 	memset(&control, 0, sizeof (struct control));
 	options.verbose = 1;
 	options.rate = 44100;
+	options.mix = -1;
 	options.driver_id = NULL;
 
 	get_options(argc, argv, &options);
@@ -235,6 +236,10 @@ int main(int argc, char **argv)
 		setenv("XMP_INSTRUMENT_PATH", options.ins_path, 1);
 	}
 
+	if (options.mix >= 0) {
+		xmp_mixer_mix(handle, options.mix);
+	}
+
 	for (first = optind; optind < argc; optind++) {
 		if (options.verbose > 0) {
 			report("\nLoading %s... (%d of %d)\n",

src/options.c

@@ -130,7 +130,7 @@ void get_options(int argc, char **argv, struct options *options)
 	int dparm = 0;
 	int o;
 
-#define OPTIONS "a:b:cD:d:f:hI:iLlM:mno:qRS:s:T:t:uVv"
+#define OPTIONS "a:b:cD:d:f:hI:iLlM:mno:P:qRS:s:T:t:uVv"
 	while ((o = getopt_long(argc, argv, OPTIONS, lopt, &optidx)) != -1) {
 		switch (o) {
 		case 'a':