Fix #173 for 2.3.5

Author: cowtowncoder

release-notes/VERSION

@@ -2,6 +2,7 @@ Project: jackson-core
 Version: 2.3.5 (xx-xxx-2014)
 
 #152: Exception for property names longer than 256k
+#173: An exception is thrown for a valid JsonPointer expression
 
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 === History: ===

src/main/java/com/fasterxml/jackson/core/JsonPointer.java

@@ -190,7 +190,7 @@ private final static int _parseIndex(String str) {
             return -1;
         }
         for (int i = 0; i < len; ++i) {
-            char c = str.charAt(i++);
+            char c = str.charAt(i);
             if (c > '9' || c < '0') {
                 return -1;
             }