FT-288 Fix warn-uninitialized errors found by gcc 4.9

ft/ft-serialize.cc

@@ -660,11 +660,11 @@ toku_deserialize_ft_from(int fd,
 {
     struct rbuf rb_0;
     struct rbuf rb_1;
-    uint64_t checkpoint_count_0;
-    uint64_t checkpoint_count_1;
+    uint64_t checkpoint_count_0 = 0;
+    uint64_t checkpoint_count_1 = 0;
     LSN checkpoint_lsn_0;
     LSN checkpoint_lsn_1;
-    uint32_t version_0, version_1, version = 0;
+    uint32_t version_0 = 0, version_1 = 0, version = 0;
     bool h0_acceptable = false;
     bool h1_acceptable = false;
     struct rbuf *rb = NULL;

ft/ft_node-serialize.cc

@@ -197,7 +197,7 @@ toku_maybe_preallocate_in_file (int fd, int64_t size, int64_t expected_size, int
 // Effect: make the file bigger by either doubling it or growing by 16MiB whichever is less, until it is at least size
 // Return 0 on success, otherwise an error number.
 {
-    int64_t file_size;
+    int64_t file_size = 0;
     //TODO(yoni): Allow variable stripe_width (perhaps from ft) for larger raids
     const uint64_t stripe_width = 4096;
     {