std.Io.Threaded: fix missing @memcpy in realPathPosix for FreeBSD

lib/std/Io/Threaded.zig

@@ -4302,6 +4302,7 @@ fn realPathPosix(current_thread: *Thread, fd: posix.fd_t, out_buffer: []u8) File
             }
             const len = std.mem.findScalar(u8, &k_file.path, 0) orelse k_file.path.len;
             if (len == 0) return error.NameTooLong;
+            @memcpy(out_buffer[0..len], k_file.path[0..len]);
             return len;
         },
         else => return error.OperationUnsupported,

lib/std/c/freebsd.zig

@@ -250,7 +250,7 @@ pub const kinfo_file = extern struct {
     /// Reserved for future cap_rights
     _cap_spare: u64,
     /// Path to file, if any.
-    path: [PATH_MAX - 1:0]u8,
+    path: [PATH_MAX]u8,
 
     comptime {
         assert(@sizeOf(@This()) == KINFO_FILE_SIZE);