builtin/commit.c: reduce scope of variables

Signed-off-by: Elia Pinto <gitter.spiros@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/commit.c

@@ -307,7 +307,6 @@ static char *prepare_index(int argc, const char **argv, const char *prefix,
 	int fd;
 	struct string_list partial;
 	struct pathspec pathspec;
-	char *old_index_env = NULL;
 	int refresh_flags = REFRESH_QUIET;
 
 	if (is_status)
@@ -320,6 +319,7 @@ static char *prepare_index(int argc, const char **argv, const char *prefix,
 		die(_("index file corrupt"));
 
 	if (interactive) {
+		char *old_index_env = NULL;
 		fd = hold_locked_index(&index_lock, 1);
 
 		refresh_cache_or_die(refresh_flags);
@@ -600,12 +600,10 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 {
 	struct stat statbuf;
 	struct strbuf committer_ident = STRBUF_INIT;
-	int commitable, saved_color_setting;
+	int commitable;
 	struct strbuf sb = STRBUF_INIT;
-	char *buffer;
 	const char *hook_arg1 = NULL;
 	const char *hook_arg2 = NULL;
-	int ident_shown = 0;
 	int clean_message_contents = (cleanup_mode != CLEANUP_NONE);
 	int old_display_comment_prefix;
 
@@ -649,6 +647,7 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 				  logfile);
 		hook_arg1 = "message";
 	} else if (use_message) {
+		char *buffer;
 		buffer = strstr(use_message_buffer, "\n\n");
 		if (!use_editor && (!buffer || buffer[2] == '\0'))
 			die(_("commit has empty message"));
@@ -753,6 +752,8 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 	/* This checks if committer ident is explicitly given */
 	strbuf_addstr(&committer_ident, git_committer_info(IDENT_STRICT));
 	if (use_editor && include_status) {
+		int ident_shown = 0;
+		int saved_color_setting;
 		char *ai_tmp, *ci_tmp;
 		if (whence != FROM_COMMIT)
 			status_printf_ln(s, GIT_COLOR_NORMAL,
@@ -1510,7 +1511,6 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
 	struct ref_lock *ref_lock;
 	struct commit_list *parents = NULL, **pptr = &parents;
 	struct stat statbuf;
-	int allow_fast_forward = 1;
 	struct commit *current_head = NULL;
 	struct commit_extra_header *extra = NULL;
 
@@ -1558,6 +1558,7 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
 	} else if (whence == FROM_MERGE) {
 		struct strbuf m = STRBUF_INIT;
 		FILE *fp;
+		int allow_fast_forward = 1;
 
 		if (!reflog_msg)
 			reflog_msg = "commit (merge)";