lib/gcrypt/MD5: move code to util/HexFormat.cxx

src/lib/gcrypt/MD5.cxx

@@ -29,6 +29,7 @@
 
 #include "MD5.hxx"
 #include "Hash.hxx"
+#include "util/HexFormat.hxx"
 
 #include <stdio.h>
 
@@ -42,13 +43,5 @@ StringBuffer<33>
 MD5Hex(ConstBuffer<void> input) noexcept
 {
 	const auto raw = MD5(input);
-	StringBuffer<33> result;
-
-	char *p = result.data();
-	for (const auto i : raw) {
-		sprintf(p, "%02x", i);
-		p += 2;
-	}
-
-	return result;
+	return HexFormatBuffer<raw.size()>(&raw.front());
 }