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ivfdec: tolerate invalid framerates (2)

add an upper bound to the framerate denominator above which 30fps will
be reported; fixes warning in corrupt / fuzzed files

Change-Id: I46a6a6f34ab756535cd009fe12273d83dcc1e9f1

--- a/ivfdec.c

+++ b/ivfdec.c

@@ -23,7 +23,7 @@

   // we can guess the framerate using only the timebase in this

   // case. Other files would require reading ahead to guess the

   // timebase, like we do for webm.

-  if (*den > 0 && *num > 0 && *num < 1000) {

+  if (*den > 0 && *den < 1000000000 && *num > 0 && *num < 1000) {

     // Correct for the factor of 2 applied to the timebase in the encoder.

     if (*num & 1)

       *den *= 2;