cleanups: remove unused variable from exec_cmd.c

Not sure whether it should be removed, or whether
execv_git_cmd() should return it rather than -1 at bottom.

Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

exec_cmd.c

@@ -32,7 +32,7 @@ const char *git_exec_path(void)
 int execv_git_cmd(const char **argv)
 {
 	char git_command[PATH_MAX + 1];
-	int len, err, i;
+	int len,  i;
 	const char *paths[] = { current_exec_path,
 				getenv("GIT_EXEC_PATH"),
 				builtin_exec_path };
@@ -85,8 +85,6 @@ int execv_git_cmd(const char **argv)
 		/* execve() can only ever return if it fails */
 		execve(git_command, (char **)argv, environ);
 
-		err = errno;
-
 		argv[0] = tmp;
 	}
 	return -1;