fix: more test fixes

src/nightwatch.zig

@@ -494,7 +494,7 @@ const KQueueBackend = struct {
         self.watches.deinit(allocator);
         var sit = self.snapshots.iterator();
         while (sit.next()) |entry| {
-            allocator.free(entry.key_ptr.*);
+            // Keys are borrowed from self.watches and freed in the watches loop above.
             var names = entry.value_ptr.*;
             var nit = names.iterator();
             while (nit.next()) |ne| allocator.free(ne.key_ptr.*);

src/nightwatch_test.zig

@@ -148,7 +148,7 @@ fn makeTempDir(allocator: std.mem.Allocator) ![]u8 {
     const name = try std.fmt.allocPrint(
         allocator,
         "/tmp/nightwatch_test_{d}_{d}",
-        .{ std.os.linux.getpid(), n },
+        .{ std.c.getpid(), n },
     );
     errdefer allocator.free(name);
     try std.fs.makeDirAbsolute(name);