Prevented a SIGSEGV with isoburn_read_image() feature to submit NULL parameter. Coverity CID 28721.

libisoburn/isofs_wrap.c

@@ -151,6 +151,7 @@ int isoburn_read_image(struct burn_drive *d,
  enum burn_disc_status status= BURN_DISC_BLANK;
  IsoDataSource *ds= NULL;
  struct isoburn *o= NULL;
+ IsoImage *new_image= NULL;
 
  msg= calloc(1, 160);
 
@@ -189,6 +190,7 @@ create_blank_image:;
      }
      iso_image_set_ignore_aclea(*image,
                          (!!(read_opts->noacl)) | ((!!read_opts->noea) << 1) );
+     new_image= *image;
    } else {
      /* Blank new image for the drive */
      iso_image_unref(o->image);
@@ -207,8 +209,9 @@ create_blank_image:;
      ret= isoburn_root_defaults(o->image, 0);
      if(ret <= 0)
        goto ex;
+     new_image= o->image;
    }
-   ret= iso_image_set_truncate_mode(*image, read_opts->truncate_mode,
+   ret= iso_image_set_truncate_mode(new_image, read_opts->truncate_mode,
                                     read_opts->truncate_length);
    if(ret < 0)
      goto ex;

xorriso/xorriso_timestamp.h

@@ -1 +1 @@
-#define Xorriso_timestamP "2015.11.09.121421"
+#define Xorriso_timestamP "2015.11.09.133135"