bug #25971: "error writing to <stdout>" with multiple -U params.

* fileio.c: Do not close the input/output stream when working on an
stdio stream.



git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@816 81a1dc3b-b13d-400b-aceb-764788c761c2

fileio.c

@@ -1150,7 +1150,7 @@ int fileio(int op, char * filename, FILEFMT format,
       rc = avr_mem_hiaddr(mem);
     }
   }
-  if (format != FMT_IMM) {
+  if (format != FMT_IMM && !using_stdio) {
     fclose(f);
   }
   return rc;