Fixed warnings and one memory loss found by valgrind

The memory loss could happen in Aria with encrypted tables when Aria failed to encrypt a block.
In normal usage this should never happen.

mysql-test/valgrind.supp

@@ -1277,6 +1277,15 @@
   fun:dlopen@@GLIBC_2.2.5
 }
 
+{
+  vasprintf in OpenSuse 12.3
+  Memcheck:Leak
+  fun:malloc
+  fun:vasprintf
+  fun:asprintf
+  fun:dlerror
+}
+
 {
    GitHub codership/galera#308
    Memcheck:Leak

storage/maria/ma_check.c

@@ -6635,17 +6635,6 @@ static void copy_data_file_state(MARIA_STATE_INFO *to,
 }
 
 
-/* Return 1 if block is full of zero's */
-
-static my_bool zero_filled_block(uchar *tmp, uint length)
-{
-  while (length--)
-    if (*(tmp++) != 0)
-      return 0;
-  return 1;
-}
-
-
 /*
   Read 'safely' next record while scanning table.
 
@@ -6753,8 +6742,7 @@ read_next_page:
             sometimes be found at end of a bitmap when we wrote a big
             record last that was moved to the next bitmap.
           */
-          if (!zero_filled_block(info->scan.page_buff, share->block_size) ||
-              _ma_check_bitmap_data(info, UNALLOCATED_PAGE, 0, 
+          if (_ma_check_bitmap_data(info, UNALLOCATED_PAGE, 0, 
                                     _ma_bitmap_get_page_bits(info,
                                                              &share->bitmap,
                                                              page)))

storage/maria/ma_crypt.c

@@ -416,7 +416,10 @@ static my_bool ma_crypt_index_pre_write_hook(PAGECACHE_IO_HOOK_ARGS *args)
     /* 2 - encrypt page */
     if (ma_encrypt(share, share->crypt_data,
                    src + head, dst + head, size, pageno, lsn, &key_version))
+    {
+      my_free(crypt_buf);
       return 1;
+    }
     /* 3 - copy tail */
     memcpy(dst + block_size - tail, src + block_size - tail, tail);
     /* 4 - store key version */