Fixed data corruption in iconv passthrough mode.

Fixed a data corruption that occured if a string longer than 1024 characters
was run through OFiconv() with source and character set being identical
and the pass-through mode being enabled (i.e. DCMTK compiled with the macro
DCMTK_ENABLE_ICONV_PASSTHROUGH). In this situation, the pointer to the next
unprocessed input character was not updated.

Thanks to DCMTK forum user cschreib for the bug report and test program.

This closes DCMTK issue #1143.

oficonv/libsrc/citrus_iconv_none.c

@@ -120,9 +120,9 @@ _citrus_iconv_none_iconv_convert(struct _citrus_iconv * ci ,
         len = *outbytes;
     }
     memcpy(*out, *in, len);
-    in += len;
+    *in += len;
     *inbytes -= len;
-    out += len;
+    *out += len;
     *outbytes -= len;
     *invalids = 0;
     if (e2big)