rerere: only return whether a path has conflicts or not

We currently return the exact number of conflict hunks a certain path
has from the 'handle_paths' function.  However all of its callers only
care whether there are conflicts or not or if there is an error.
Return only that information, and document that only that information
is returned.  This will simplify the code in the subsequent steps.

Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

rerere.c

@@ -393,12 +393,13 @@ static int is_cmarker(char *buf, int marker_char, int marker_size)
  * one side of the conflict, NUL, the other side of the conflict,
  * and NUL concatenated together.
  *
- * Return the number of conflict hunks found.
+ * Return 1 if conflict hunks are found, 0 if there are no conflict
+ * hunks and -1 if an error occured.
  */
 static int handle_path(unsigned char *sha1, struct rerere_io *io, int marker_size)
 {
 	git_SHA_CTX ctx;
-	int hunk_no = 0;
+	int has_conflicts = 0;
 	enum {
 		RR_CONTEXT = 0, RR_SIDE_1, RR_SIDE_2, RR_ORIGINAL
 	} hunk = RR_CONTEXT;
@@ -426,7 +427,7 @@ static int handle_path(unsigned char *sha1, struct rerere_io *io, int marker_siz
 				goto bad;
 			if (strbuf_cmp(&one, &two) > 0)
 				strbuf_swap(&one, &two);
-			hunk_no++;
+			has_conflicts = 1;
 			hunk = RR_CONTEXT;
 			rerere_io_putconflict('<', marker_size, io);
 			rerere_io_putmem(one.buf, one.len, io);
@@ -462,7 +463,7 @@ static int handle_path(unsigned char *sha1, struct rerere_io *io, int marker_siz
 		git_SHA1_Final(sha1, &ctx);
 	if (hunk != RR_CONTEXT)
 		return -1;
-	return hunk_no;
+	return has_conflicts;
 }
 
 /*
@@ -471,7 +472,7 @@ static int handle_path(unsigned char *sha1, struct rerere_io *io, int marker_siz
  */
 static int handle_file(const char *path, unsigned char *sha1, const char *output)
 {
-	int hunk_no = 0;
+	int has_conflicts = 0;
 	struct rerere_io_file io;
 	int marker_size = ll_merge_marker_size(path);
 
@@ -491,7 +492,7 @@ static int handle_file(const char *path, unsigned char *sha1, const char *output
 		}
 	}
 
-	hunk_no = handle_path(sha1, (struct rerere_io *)&io, marker_size);
+	has_conflicts = handle_path(sha1, (struct rerere_io *)&io, marker_size);
 
 	fclose(io.input);
 	if (io.io.wrerror)
@@ -500,14 +501,14 @@ static int handle_file(const char *path, unsigned char *sha1, const char *output
 	if (io.io.output && fclose(io.io.output))
 		io.io.wrerror = error_errno(_("failed to flush '%s'"), path);
 
-	if (hunk_no < 0) {
+	if (has_conflicts < 0) {
 		if (output)
 			unlink_or_warn(output);
 		return error(_("could not parse conflict hunks in '%s'"), path);
 	}
 	if (io.io.wrerror)
 		return -1;
-	return hunk_no;
+	return has_conflicts;
 }
 
 /*
@@ -954,7 +955,7 @@ static int handle_cache(const char *path, unsigned char *sha1, const char *outpu
 	mmfile_t mmfile[3] = {{NULL}};
 	mmbuffer_t result = {NULL, 0};
 	const struct cache_entry *ce;
-	int pos, len, i, hunk_no;
+	int pos, len, i, has_conflicts;
 	struct rerere_io_mem io;
 	int marker_size = ll_merge_marker_size(path);
 
@@ -1008,11 +1009,11 @@ static int handle_cache(const char *path, unsigned char *sha1, const char *outpu
 	 * Grab the conflict ID and optionally write the original
 	 * contents with conflict markers out.
 	 */
-	hunk_no = handle_path(sha1, (struct rerere_io *)&io, marker_size);
+	has_conflicts = handle_path(sha1, (struct rerere_io *)&io, marker_size);
 	strbuf_release(&io.input);
 	if (io.io.output)
 		fclose(io.io.output);
-	return hunk_no;
+	return has_conflicts;
 }
 
 static int rerere_forget_one_path(const char *path, struct string_list *rr)