[liblouis-liblouisxml] [patch] correct inpos where the output length of a rule is larger than its input length

Hi all,
Attached is a patch to fix the inpos array values for the case where a rule has an output length which is larger than its input length. For example, using UEBC, given the input "#", the output will be "_?". The array mapping from output to input (inpos) previously specified [0, 1], which is incorrect; there is no character at index 1 in the input. This patch fixes this to be the correct result; i.e. [0, 0].
Note that this was a regression introduced in 1.3.8. However, this is not simply a revert of the problematic code, as that code was necessary to fix a bug relating to 0 length input; e.g. computer braille prefixes and suffixes. This patch takes both cases into account. 

Jamie

--
James Teh
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Index: liblouis/lou_translateString.c
===================================================================
--- liblouis/lou_translateString.c      (revision 39)
+++ liblouis/lou_translateString.c      (working copy)
@@ -415,7 +415,7 @@
            }
          for (k = inLength; k < outLength; k++)
            if (inputPositions != NULL)
-             inputPositions[dest + k] = src + inLength;
+             inputPositions[dest + k] = src + (inLength > 0 ? inLength - 1 : 
0);
        }
     }
   dest += outLength;

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