Merge branch 'ak/extract-argv0-last-dir-sep' into maint

Code simplification.

* ak/extract-argv0-last-dir-sep:
  exec_cmd.c: use find_last_dir_sep() for code simplification

exec_cmd.c

@@ -44,12 +44,10 @@ const char *git_extract_argv0_path(const char *argv0)
 
 	if (!argv0 || !*argv0)
 		return NULL;
-	slash = argv0 + strlen(argv0);
 
-	while (argv0 <= slash && !is_dir_sep(*slash))
-		slash--;
+	slash = find_last_dir_sep(argv0);
 
-	if (slash >= argv0) {
+	if (slash) {
 		argv0_path = xstrndup(argv0, slash - argv0);
 		return slash + 1;
 	}