Another occurance of possible valgrind/purify "uninitialized memory"

complaint related to the PRNG: with PURIFY policy don't feed uninitialized
memory into the PRNG.

Submitted by: Bodo Moeller <bmoeller@openssl.org> :-)

crypto/rand/randfile.c

@@ -129,7 +129,11 @@ int RAND_load_file(const char *file, long bytes)
 		i=fread(buf,1,n,in);
 		if (i <= 0) break;
 		/* even if n != i, use the full array */
+#ifdef PURIFY
+		RAND_add(buf,i,(double)i);
+#else
 		RAND_add(buf,n,(double)i);
+#endif
 		ret+=i;
 		if (bytes > 0)
 			{