Avoid static analyzer warnings regarding uninitialized arguments

Avoid static analyzer warnings regarding "Function call argument
is a pointer to uninitialized value" in cases where we are
intentionally using such arguments.

This is achieved by using ...

`f(b.begin(), b.end())` (`std::array<char, N>`)

... instead of ...

`f(b, b + N)` (`char b[N]`)

Rationale:
* Reduce false positives by guiding static analyzers regarding our
  intentions.

Before this commit:

```
$ clang-tidy-3.5 -checks=* src/bench/base58.cpp
bench/base58.cpp:23:9: warning: Function call argument is a pointer to uninitialized value [clang-analyzer-core.CallAndMessage]
        EncodeBase58(b, b + 32);
        ^
$ clang-tidy-3.5 -checks=* src/bench/verify_script.cpp
bench/verify_script.cpp:59:5: warning: Function call argument is a pointer to uninitialized value [clang-analyzer-core.CallAndMessage]
    key.Set(vchKey, vchKey + 32, false);
    ^
$
```

After this commit:

```
$ clang-tidy-3.5 -checks=* src/bench/base58.cpp
$ clang-tidy-3.5 -checks=* src/bench/verify_script.cpp
$
```

1 files changed, 8 insertions, 2 deletions

diff --git a/src/bench/verify_script.cpp b/src/bench/verify_script.cpp
index 23bbadc88d..ef7381c120 100644
--- a/src/bench/verify_script.cpp
+++ b/src/bench/verify_script.cpp
@@ -11,6 +11,8 @@
 #include "script/sign.h"
 #include "streams.h"
 
+#include <array>
+
 // FIXME: Dedup with BuildCreditingTransaction in test/script_tests.cpp.
 static CMutableTransaction BuildCreditingTransaction(const CScript& scriptPubKey)
 {
@@ -55,8 +57,12 @@ static void VerifyScriptBench(benchmark::State& state)
 
     // Keypair.
     CKey key;
-    const unsigned char vchKey[32] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
-    key.Set(vchKey, vchKey + 32, false);
+    static const std::array<unsigned char, 32> vchKey = {
+        {
+            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
+        }
+    };
+    key.Set(vchKey.begin(), vchKey.end(), false);
     CPubKey pubkey = key.GetPubKey();
     uint160 pubkeyHash;
     CHash160().Write(pubkey.begin(), pubkey.size()).Finalize(pubkeyHash.begin());