Remove dubious assertion.

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

Committed: https://code.google.com/p/skia/source/detail?r=8418

[tfarina, 2013-03-27 13:12:45]

Is this the right fix?

[tfarina, 2013-03-27 13:15:19]

Would a better fix to compare |format| against kConfigCount? I guess that is
what it's trying to do?

[reed1, 2013-03-27 14:13:06]

lgtm

[tfarina, 2013-03-27 21:24:55]

Committed patchset #1 manually as r8418 (presubmit successful).