fix a typo in ISurfaceTexture IPC code

Change-Id: Ied1d9ddb0d849b17219d0ea3d333ce12be849419
diff --git a/libs/gui/ISurfaceTexture.cpp b/libs/gui/ISurfaceTexture.cpp
index ec06bc0..41434a4 100644
--- a/libs/gui/ISurfaceTexture.cpp
+++ b/libs/gui/ISurfaceTexture.cpp
@@ -276,7 +276,7 @@
         case DISCONNECT: {
             CHECK_INTERFACE(ISurfaceTexture, data, reply);
             int api = data.readInt32();
-            status_t res = connect(api);
+            status_t res = disconnect(api);
             reply->writeInt32(res);
             return NO_ERROR;
         } break;