xdiff: delete local variables that alias fields in xrecord_t

Use the type xrecord_t as the local variable for the functions in the
file xdiff/xemit.c. Most places directly reference the fields inside of
this struct, doing that here makes it more consistent with the rest of
the code.

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

Author: ezekielnewren

xdiff/xemit.c

@@ -23,12 +23,11 @@
 #include "xinclude.h"
 
 
-static int xdl_emit_record(xdfile_t *xdf, long ri, char const *pre, xdemitcb_t *ecb) {
-	long size, psize = strlen(pre);
-	char const *rec = xdf->recs[ri]->ptr;
+static int xdl_emit_record(xdfile_t *xdf, long ri, char const *pre, xdemitcb_t *ecb)
+{
+	xrecord_t *rec = xdf->recs[ri];
 
-	size = xdf->recs[ri]->size;
-	if (xdl_emit_diffrec(rec, size, pre, psize, ecb) < 0)
+	if (xdl_emit_diffrec(rec->ptr, rec->size, pre, strlen(pre), ecb) < 0)
 		return -1;
 
 	return 0;
@@ -111,11 +110,11 @@ static long def_ff(const char *rec, long len, char *buf, long sz)
 static long match_func_rec(xdfile_t *xdf, xdemitconf_t const *xecfg, long ri,
 			   char *buf, long sz)
 {
-	const char *rec = xdf->recs[ri]->ptr;
-	long len = xdf->recs[ri]->size;
+	xrecord_t *rec = xdf->recs[ri];
+
 	if (!xecfg->find_func)
-		return def_ff(rec, len, buf, sz);
-	return xecfg->find_func(rec, len, buf, sz, xecfg->find_func_priv);
+		return def_ff(rec->ptr, rec->size, buf, sz);
+	return xecfg->find_func(rec->ptr, rec->size, buf, sz, xecfg->find_func_priv);
 }
 
 static int is_func_rec(xdfile_t *xdf, xdemitconf_t const *xecfg, long ri)
@@ -151,14 +150,12 @@ static long get_func_line(xdfenv_t *xe, xdemitconf_t const *xecfg,
 
 static int is_empty_rec(xdfile_t *xdf, long ri)
 {
-	const char *rec = xdf->recs[ri]->ptr;
-	long len = xdf->recs[ri]->size;
+	xrecord_t *rec = xdf->recs[ri];
+	long i = 0;
 
-	while (len > 0 && XDL_ISSPACE(*rec)) {
-		rec++;
-		len--;
-	}
-	return !len;
+	for (; i < rec->size && XDL_ISSPACE(rec->ptr[i]); i++);
+
+	return i == rec->size;
 }
 
 int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,