Check in a clang-tidy

This should've been done when we first created the repo, but better late
than never.

Signed-off-by: Ed Tanous <edtanous@google.com>
Signed-off-by: John Edward Broadbent <jebr@google.com>
Change-Id: I68da1d13167ec94f9d008dea307c9f23a991d42c
diff --git a/src/erase/pattern.cpp b/src/erase/pattern.cpp
index 0e510a0..5563661 100644
--- a/src/erase/pattern.cpp
+++ b/src/erase/pattern.cpp
@@ -30,8 +30,11 @@
     // static seed defines a fixed prng sequnce so it can be verified later,
     // and validated for entropy
     uint64_t currentIndex = 0;
+
+    // random number generator seeded with a constant value will
+    // generate a predictable sequence of values NOLINTNEXTLINE
     std::minstd_rand0 generator(seed);
-    std::array<std::byte, blockSize> randArr;
+    std::array<std::byte, blockSize> randArr{};
 
     ManagedFd fd =
         stdplus::fd::open(devPath, stdplus::fd::OpenAccess::WriteOnly);
@@ -65,9 +68,11 @@
 {
 
     uint64_t currentIndex = 0;
+    // random number generator seeded with a constant value will
+    // generate a predictable sequence of values NOLINTNEXTLINE
     std::minstd_rand0 generator(seed);
-    std::array<std::byte, blockSize> randArr;
-    std::array<std::byte, blockSize> readArr;
+    std::array<std::byte, blockSize> randArr{};
+    std::array<std::byte, blockSize> readArr{};
 
     ManagedFd fd =
         stdplus::fd::open(devPath, stdplus::fd::OpenAccess::ReadOnly);