Fix for incorrect variable declaration.

Commit 336aa0b7da8a35ba57400ce92fc016fc7fb35233 incorrectly
declared current_pos as and int, when it should have been
a FIRSTPASS_STATS pointer.

Change-Id: I0a51c7a86ebba8546c95dd5d9d1c1143d4613e40

vp8/encoder/firstpass.c

diff --git a/vp8/encoder/firstpass.c b/vp8/encoder/firstpass.c
index 3e67bf5..06e26be 100644
--- a/vp8/encoder/firstpass.c
+++ b/vp8/encoder/firstpass.c
@@ -2423,7 +2423,7 @@
     if (cpi->oxcf.auto_key
         && cpi->frames_to_key > (int)cpi->key_frame_frequency )
     {
-        int current_pos = cpi->stats_in;
+        FIRSTPASS_STATS *current_pos = cpi->stats_in;
         FIRSTPASS_STATS tmp_frame;
 
         cpi->frames_to_key /= 2;