config_parse: rename `data` parameter to `payload` for clarity

By convention, parameters that get passed to callbacks are
usually named `payload` in our codebase. Rename the `data`
parameters in the configuration parser callbacks to `payload` to
avoid confusion.

src/config_parse.c

@@ -482,7 +482,7 @@ int git_config_parse(
 	git_config_parser_variable_cb on_variable,
 	git_config_parser_comment_cb on_comment,
 	git_config_parser_eof_cb on_eof,
-	void *data)
+	void *payload)
 {
 	git_parse_ctx *ctx;
 	char *current_section = NULL, *var_name = NULL, *var_value = NULL;
@@ -522,7 +522,7 @@ int git_config_parse(
 			git_parse_advance_chars(ctx, result);
 
 			if (on_section)
-				result = on_section(parser, current_section, line_start, line_len, data);
+				result = on_section(parser, current_section, line_start, line_len, payload);
 			/*
 			 * After we've parsed the section header we may not be
 			 * done with the line. If there's still data in there,
@@ -542,13 +542,13 @@ int git_config_parse(
 		case ';':
 		case '#':
 			if (on_comment) {
-				result = on_comment(parser, line_start, line_len, data);
+				result = on_comment(parser, line_start, line_len, payload);
 			}
 			break;
 
 		default: /* assume variable declaration */
 			if ((result = parse_variable(parser, &var_name, &var_value)) == 0 && on_variable) {
-				result = on_variable(parser, current_section, var_name, var_value, line_start, line_len, data);
+				result = on_variable(parser, current_section, var_name, var_value, line_start, line_len, payload);
 				git__free(var_name);
 				git__free(var_value);
 			}
@@ -561,7 +561,7 @@ int git_config_parse(
 	}
 
 	if (on_eof)
-		result = on_eof(parser, current_section, data);
+		result = on_eof(parser, current_section, payload);
 
 out:
 	git__free(current_section);

src/config_parse.h

@@ -34,7 +34,7 @@ typedef int (*git_config_parser_section_cb)(
 	const char *current_section,
 	const char *line,
 	size_t line_len,
-	void *data);
+	void *payload);
 
 typedef int (*git_config_parser_variable_cb)(
 	git_config_parser *parser,
@@ -43,18 +43,18 @@ typedef int (*git_config_parser_variable_cb)(
 	const char *var_value,
 	const char *line,
 	size_t line_len,
-	void *data);
+	void *payload);
 
 typedef int (*git_config_parser_comment_cb)(
 	git_config_parser *parser,
 	const char *line,
 	size_t line_len,
-	void *data);
+	void *payload);
 
 typedef int (*git_config_parser_eof_cb)(
 	git_config_parser *parser,
 	const char *current_section,
-	void *data);
+	void *payload);
 
 int git_config_parse(
 	git_config_parser *parser,
@@ -62,6 +62,6 @@ int git_config_parse(
 	git_config_parser_variable_cb on_variable,
 	git_config_parser_comment_cb on_comment,
 	git_config_parser_eof_cb on_eof,
-	void *data);
+	void *payload);
 
 #endif