fix windows VC9 build

Move variable declarations to the top of the functions.

src/pygit2/diff.c

@@ -55,6 +55,9 @@ static int diff_hunk_cb(
 {
     PyObject *hunks;
     Hunk *hunk;
+    int len;
+    char* old_path, *new_path;
+
 
     hunks = PyDict_GetItemString(cb_data, "hunks");
     if (hunks == NULL) {
@@ -71,9 +74,6 @@ static int diff_hunk_cb(
     hunk->new_start = range->new_start;
     hunk->new_lines = range->new_lines;
 
-    int len;
-    char* old_path, *new_path;
-
     if (delta->old_file.path != NULL) {
         len = strlen(delta->old_file.path) + 1;
         old_path = malloc(sizeof(char) * len);

src/pygit2/error.c

@@ -4,6 +4,7 @@ PyObject *GitError;
 
 PyObject * Error_type(int type)
 {
+    const git_error* error;
     // Expected
     switch (type) {
         /** Input does not exist in the scope searched. */
@@ -32,7 +33,7 @@ PyObject * Error_type(int type)
     }
 
     // Critical
-    const git_error* error = giterr_last();
+    error = giterr_last();
     if(error != NULL) {
         switch (error->klass) {
             case GITERR_NOMEMORY:
@@ -66,13 +67,14 @@ PyObject* Error_set(int err)
 
 PyObject* Error_set_str(int err, const char *str)
 {
+    const git_error* error;
     if (err == GIT_ENOTFOUND) {
         /* KeyError expects the arg to be the missing key. */
         PyErr_SetString(PyExc_KeyError, str);
         return NULL;
     }
 
-    const git_error* error = giterr_last();
+    error = giterr_last();
     return PyErr_Format(Error_type(err), "%s: %s", str, error->message);
 }