Merge bitcoin#10272: [Tests] Prevent warning: variable 'x' is uninitialized

5ec8836 Prevent warning: variable 'x' is uninitialized (Pavel Janík)

Tree-SHA512: 54e39d4b85303db033bd08c52ff2fa093ec9a1b1b9550911bb2123be60fa471cba81f36859681170695dfafb3a8a4c154122917c05b5a23837cf97c25907afc1

Author: laanwj

src/bench/crypto_hash.cpp

@@ -92,7 +92,7 @@ static void HASH_SipHash_0032b(benchmark::State& state)
 static void FastRandom_32bit(benchmark::State& state)
 {
     FastRandomContext rng(true);
-    uint32_t x;
+    uint32_t x = 0;
     while (state.KeepRunning()) {
         for (int i = 0; i < 1000000; i++) {
             x += rng.rand32();
@@ -103,7 +103,7 @@ static void FastRandom_32bit(benchmark::State& state)
 static void FastRandom_1bit(benchmark::State& state)
 {
     FastRandomContext rng(true);
-    uint32_t x;
+    uint32_t x = 0;
     while (state.KeepRunning()) {
         for (int i = 0; i < 1000000; i++) {
             x += rng.randbool();