xdiff: make xdfile_t.nreff a size_t instead of long

size_t is used because nreff describes the number of elements in memory
for rindex.

Signed-off-by: Ezekiel Newren <ezekielnewren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

xdiff/xprepare.c

diff --git a/xdiff/xprepare.c b/xdiff/xprepare.c
index 705ddd1..39fd79d 100644
--- a/xdiff/xprepare.c
+++ b/xdiff/xprepare.c
@@ -264,7 +264,7 @@ static bool xdl_clean_mmatch(uint8_t const *action, long i, long s, long e) {
  * might be potentially discarded if they appear in a run of discardable.
  */
 static int xdl_cleanup_records(xdlclassifier_t *cf, xdfile_t *xdf1, xdfile_t *xdf2) {
-	long i, nm, nreff, mlim;
+	long i, nm, mlim;
 	xrecord_t *recs;
 	xdlclass_t *rcrec;
 	uint8_t *action1 = NULL, *action2 = NULL;
@@ -307,29 +307,29 @@ static int xdl_cleanup_records(xdlclassifier_t *cf, xdfile_t *xdf1, xdfile_t *xd
 	 * Use temporary arrays to decide if changed[i] should remain
 	 * false, or become true.
 	 */
-	for (nreff = 0, i = xdf1->dstart, recs = &xdf1->recs[xdf1->dstart];
+	xdf1->nreff = 0;
+	for (i = xdf1->dstart, recs = &xdf1->recs[xdf1->dstart];
 	     i <= xdf1->dend; i++, recs++) {
 		if (action1[i] == KEEP ||
 		    (action1[i] == INVESTIGATE && !xdl_clean_mmatch(action1, i, xdf1->dstart, xdf1->dend))) {
-			xdf1->rindex[nreff++] = i;
+			xdf1->rindex[xdf1->nreff++] = i;
 			/* changed[i] remains false, i.e. keep */
 		} else
 			xdf1->changed[i] = true;
 			/* i.e. discard */
 	}
-	xdf1->nreff = nreff;
 
-	for (nreff = 0, i = xdf2->dstart, recs = &xdf2->recs[xdf2->dstart];
+	xdf2->nreff = 0;
+	for (i = xdf2->dstart, recs = &xdf2->recs[xdf2->dstart];
 	     i <= xdf2->dend; i++, recs++) {
 		if (action2[i] == KEEP ||
 		    (action2[i] == INVESTIGATE && !xdl_clean_mmatch(action2, i, xdf2->dstart, xdf2->dend))) {
-			xdf2->rindex[nreff++] = i;
+			xdf2->rindex[xdf2->nreff++] = i;
 			/* changed[i] remains false, i.e. keep */
 		} else
 			xdf2->changed[i] = true;
 			/* i.e. discard */
 	}
-	xdf2->nreff = nreff;
 
 cleanup:
 	xdl_free(action1);

xdiff/xtypes.h

diff --git a/xdiff/xtypes.h b/xdiff/xtypes.h
index 4c4d9bd..1f495f9 100644
--- a/xdiff/xtypes.h
+++ b/xdiff/xtypes.h
@@ -51,7 +51,7 @@ typedef struct s_xdfile {
 	ptrdiff_t dstart, dend;
 	bool *changed;
 	long *rindex;
-	long nreff;
+	size_t nreff;
 } xdfile_t;
 
 typedef struct s_xdfenv {