Fix uninit memory read in undo code.  Fix uint32_t in proto file.
A few minor changes.
diff --git a/src/sha256.c b/src/sha256.c
index 048ce75..6ea3f81 100644
--- a/src/sha256.c
+++ b/src/sha256.c
@@ -360,7 +360,7 @@
 	else
 	{
 	    sha256_start(&ctx);
-	    memset(buf, 'a', 1000);
+	    vim_memset(buf, 'a', 1000);
 	    for (j = 0; j < 1000; j++)
 		sha256_update(&ctx, (char_u *)buf, 1000);
 	    sha256_finish(&ctx, sha256sum);