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ivfdec: tolerate invalid framerates

default invalid framerates to 30, quiets warnings in corrupt / fuzzed
files

Change-Id: Ib10d2b67df83cb6f9ed1cd6ef8e0e637aa7099ff

--- 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 (*num < 1000) {

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

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

     if (*num & 1)

       *den *= 2;