patch_parse: treat complete line after "---"/"+++" as path

When parsing the "---" and "+++" line, we stop after the first
whitespace inside of the filename. But as files containing whitespaces
do not need to be quoted, we should instead use the complete line here.

This fixes parsing patches with unquoted paths with whitespaces.

src/patch_parse.c

@@ -53,11 +53,9 @@ static int header_path_len(git_patch_parse_ctx *ctx)
 	return len;
 }
 
-static int parse_header_path_buf(git_buf *path, git_patch_parse_ctx *ctx)
+static int parse_header_path_buf(git_buf *path, git_patch_parse_ctx *ctx, size_t path_len)
 {
-	int path_len, error = 0;
-
-	path_len = header_path_len(ctx);
+	int error;
 
 	if ((error = git_buf_put(path, ctx->parse_ctx.line, path_len)) < 0)
 		goto done;
@@ -81,7 +79,7 @@ done:
 static int parse_header_path(char **out, git_patch_parse_ctx *ctx)
 {
 	git_buf path = GIT_BUF_INIT;
-	int error = parse_header_path_buf(&path, ctx);
+	int error = parse_header_path_buf(&path, ctx, header_path_len(ctx));
 
 	*out = git_buf_detach(&path);
 
@@ -91,13 +89,33 @@ static int parse_header_path(char **out, git_patch_parse_ctx *ctx)
 static int parse_header_git_oldpath(
 	git_patch_parsed *patch, git_patch_parse_ctx *ctx)
 {
-	return parse_header_path(&patch->old_path, ctx);
+	git_buf old_path = GIT_BUF_INIT;
+	int error;
+
+	if ((error = parse_header_path_buf(&old_path, ctx, ctx->parse_ctx.line_len - 1)) <  0)
+		goto out;
+
+	patch->old_path = git_buf_detach(&old_path);
+
+out:
+	git_buf_free(&old_path);
+	return error;
 }
 
 static int parse_header_git_newpath(
 	git_patch_parsed *patch, git_patch_parse_ctx *ctx)
 {
-	return parse_header_path(&patch->new_path, ctx);
+	git_buf new_path = GIT_BUF_INIT;
+	int error;
+
+	if ((error = parse_header_path_buf(&new_path, ctx, ctx->parse_ctx.line_len - 1)) <  0)
+		goto out;
+
+	patch->new_path = git_buf_detach(&new_path);
+
+out:
+	git_buf_free(&new_path);
+	return error;
 }
 
 static int parse_header_mode(uint16_t *mode, git_patch_parse_ctx *ctx)
@@ -213,7 +231,7 @@ static int parse_header_rename(
 {
 	git_buf path = GIT_BUF_INIT;
 
-	if (parse_header_path_buf(&path, ctx) < 0)
+	if (parse_header_path_buf(&path, ctx, header_path_len(ctx)) < 0)
 		return -1;
 
 	/* Note: the `rename from` and `rename to` lines include the literal