firmware-utils: fix -Wmaybe-uninitialized warnings

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

tools/firmware-utils/src/asustrx.c

@@ -150,7 +150,8 @@ static void usage() {
 int main(int argc, char **argv) {
 	struct trx_header hdr;
 	struct asustrx_tail tail = { };
-	FILE *in, *out;
+	FILE *out = NULL;
+	FILE *in = NULL;
 	uint8_t buf[1024];
 	size_t bytes;
 	size_t length = 0;

tools/firmware-utils/src/mkcasfw.c

@@ -554,6 +554,10 @@ csum_get(struct csum_state *css)
 		break;
 	case CSUM_TYPE_32:
 		ret = csum32_get(css);
+		break;
+	default:
+		ERR("invalid checksum size\n");
+		return 0;
 	}
 
 	return ret;
@@ -755,6 +759,9 @@ write_out_header(FILE *outfile)
 		res = write_out_data(outfile, (uint8_t *)&tmp.nfs,
 					sizeof(tmp.nfs), NULL);
 		break;
+	default:
+		ERR("invalid header type\n");
+		return -EINVAL;
 	}
 
 	return res;

tools/firmware-utils/src/mkcsysimg.c

@@ -493,6 +493,9 @@ csum_get(struct csum_state *css)
 	case CSUM_SIZE_16:
 		ret = csum16_get(css);
 		break;
+	default:
+		ERR("invalid checksum size\n");
+		return 0;
 	}
 
 	return ret;

tools/firmware-utils/src/mkdapimg.c

@@ -68,7 +68,8 @@ main(int ac, char *av[])
 	int fixmode = 0;
 	int have_regionversion = 0;
 
-	FILE *ifile, *ofile;
+	FILE *ifile = NULL;
+	FILE *ofile = NULL;
 	int c;
 	uint32_t cksum;
 	uint32_t bcnt;

tools/firmware-utils/src/mkdapimg2.c

@@ -92,7 +92,8 @@ main(int ac, char *av[])
 	char region[MAX_REG_LEN];
 	int kernel = 0;
 
-	FILE *ifile, *ofile;
+	FILE *ifile = NULL;
+	FILE *ofile = NULL;
 	int c;
 
 	uint32_t cksum;

tools/firmware-utils/src/mkrtn56uimg.c

@@ -251,7 +251,8 @@ int
 main(int argc, char **argv)
 {
 	int 		opt;
-	char 		*filename, *progname;
+	char 		*filename = NULL;
+	char		*progname;
 	op_mode_t	opmode = NONE;
 
 	progname = argv[0];