Remove dubious assertion.

Clang error report:

../../src/animator/SkDrawBitmap.cpp:89:21: error: comparison of constant 4294967295
with expression of type 'int' is always true [-Werror,-Wtautological-constant-out-of-range-compare]
    SkASSERT(format != (SkBitmap::Config) -1);
                 ~~~~~~ ^  ~~~~~~~~~~~~~~~~~~~~~

R=bsalomon@google.com,reed@google.com

Review URL: https://codereview.chromium.org/12770023

git-svn-id: http://skia.googlecode.com/svn/trunk@8418 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed