Write "unique_mbr_signature" only once to MBR!

---
 src/lib/disk.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/src/lib/disk.c
+++ b/src/lib/disk.c
@@ -353,7 +353,7 @@ msdos_disk_get_partition_info (int fd, l
 		printf("******************************************************\n\n");
 		
 	}
-	else if (opts.write_signature) {
+	else if (!mbr->unique_mbr_signature) {
 		
 		/* MBR Signatures must be unique for the 
 		   EFI Boot Manager