Fixed a few places where uninitialized memory could have been read

Also added early exit in SkImageFilter's constructor to avoid attempting to deserialize all inputs once a bad input has been found. This avoids hanging if a filter pretends to have 1 billion inputs when that's just an error on the number of inputs read by the filter.

BUG=326206,326197,326229
R=senorblanco@chromium.org, senorblanco@google.com, reed@google.com, sugoi@google.com

Author: sugoi@chromium.org

Review URL: https://codereview.chromium.org/106943002

git-svn-id: http://skia.googlecode.com/svn/trunk@12544 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleFilterFuzz.cpp b/samplecode/SampleFilterFuzz.cpp
index d15c6eb..06e14f0 100644
--- a/samplecode/SampleFilterFuzz.cpp
+++ b/samplecode/SampleFilterFuzz.cpp
@@ -31,6 +31,9 @@
 #include <stdio.h>
 #include <time.h>
 
+//#define SK_ADD_RANDOM_BIT_FLIPS
+//#define SK_FUZZER_IS_VERBOSE
+
 static const uint32_t kSeed = (uint32_t)(time(NULL));
 static SkRandom gRand(kSeed);
 static bool return_large = false;