fiptool: Initialize opt_index to 0 for getopt(3)

Change-Id: I62c1a636eb0d9f73fa3a6356e32b5a44f268d421
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>

tools/fiptool/fiptool.c

@@ -570,7 +570,7 @@ static int create_cmd(int argc, char *argv[])
 	add_opt(opts, ++i, NULL, 0, 0);
 
 	while (1) {
-		int c, opt_index;
+		int c, opt_index = 0;
 
 		c = getopt_long(argc, argv, "", opts, &opt_index);
 		if (c == -1)
@@ -641,7 +641,7 @@ static int update_cmd(int argc, char *argv[])
 	add_opt(opts, ++i, NULL, 0, 0);
 
 	while (1) {
-		int c, opt_index;
+		int c, opt_index = 0;
 
 		c = getopt_long(argc, argv, "o:", opts, &opt_index);
 		if (c == -1)
@@ -728,7 +728,7 @@ static int unpack_cmd(int argc, char *argv[])
 	add_opt(opts, ++i, NULL, 0, 0);
 
 	while (1) {
-		int c, opt_index;
+		int c, opt_index = 0;
 
 		c = getopt_long(argc, argv, "fo:", opts, &opt_index);
 		if (c == -1)
@@ -845,7 +845,7 @@ static int remove_cmd(int argc, char *argv[])
 	add_opt(opts, ++i, NULL, 0, 0);
 
 	while (1) {
-		int c, opt_index;
+		int c, opt_index = 0;
 
 		c = getopt_long(argc, argv, "fo:", opts, &opt_index);
 		if (c == -1)