Disable clang-tidy for some malloc tests.

The clang-analyzer-unix.Malloc and other warnings in these
unit tests are either false positive or in
negative tests that can be ignored.

Bug: 259995529
Test: presubmits; make tidy-bionic-libc_subset
Change-Id: Iddabe613d21d3717ba34f9e4d5bb97436279649f
diff --git a/libc/malloc_hooks/Android.bp b/libc/malloc_hooks/Android.bp
index 01394da..6b4e606 100644
--- a/libc/malloc_hooks/Android.bp
+++ b/libc/malloc_hooks/Android.bp
@@ -59,6 +59,11 @@
     name: "malloc_hooks_system_tests",
     isolated: true,
 
+    // The clang-analyzer-unix.Malloc and other warnings in these
+    // unit tests are either false positive or in
+    // negative tests that can be ignored.
+    tidy: false,
+
     srcs: [
         "tests/malloc_hooks_tests.cpp",
     ],