Fix for valgrind use of uninitialized variable
Fix for valgrind use of uninitialized variable

TBR=bsalomon@google.com
BUG=skia:

Review URL: https://codereview.chromium.org/1217843002

Hikari-no-Tenshi/android_external_skia,google/skia,nvoron23/skia,nvoron23/skia,tmpvar/skia.cc,aosp-mirror/platform_external_skia,tmpvar/skia.cc,google/skia,nvoron23/skia,HalCanary/skia-hc,noselhq/skia,Hikari-no-Tenshi/android_external_skia,Hikari-no-Tenshi/android_external_skia,vanish87/skia,noselhq/skia,qrealka/skia-hc,tmpvar/skia.cc,google/skia,tmpvar/skia.cc,tmpvar/skia.cc,shahrzadmn/skia,HalCanary/skia-hc,nvoron23/skia,vanish87/skia,rubenvb/skia,aosp-mirror/platform_external_skia,noselhq/skia,pcwalton/skia,HalCanary/skia-hc,todotodoo/skia,rubenvb/skia,Jichao/skia,qrealka/skia-hc,todotodoo/skia,Hikari-no-Tenshi/android_external_skia,noselhq/skia,pcwalton/skia,Jichao/skia,nvoron23/skia,rubenvb/skia,todotodoo/skia,qrealka/skia-hc,Hikari-no-Tenshi/android_external_skia,Jichao/skia,aosp-mirror/platform_external_skia,qrealka/skia-hc,rubenvb/skia,google/skia,todotodoo/skia,vanish87/skia,noselhq/skia,rubenvb/skia,google/skia,nvoron23/skia,vanish87/skia,HalCanary/skia-hc,qrealka/skia-hc,shahrzadmn/skia,shahrzadmn/skia,ominux/skia,rubenvb/skia,noselhq/skia,pcwalton/skia,google/skia,todotodoo/skia,shahrzadmn/skia,ominux/skia,todotodoo/skia,pcwalton/skia,shahrzadmn/skia,ominux/skia,rubenvb/skia,pcwalton/skia,rubenvb/skia,shahrzadmn/skia,rubenvb/skia,ominux/skia,ominux/skia,vanish87/skia,pcwalton/skia,Jichao/skia,todotodoo/skia,qrealka/skia-hc,HalCanary/skia-hc,tmpvar/skia.cc,vanish87/skia,vanish87/skia,pcwalton/skia,noselhq/skia,ominux/skia,Jichao/skia,google/skia,pcwalton/skia,todotodoo/skia,tmpvar/skia.cc,google/skia,shahrzadmn/skia,ominux/skia,aosp-mirror/platform_external_skia,ominux/skia,google/skia,shahrzadmn/skia,qrealka/skia-hc,HalCanary/skia-hc,HalCanary/skia-hc,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,tmpvar/skia.cc,vanish87/skia,Jichao/skia,aosp-mirror/platform_external_skia,google/skia,tmpvar/skia.cc,Jichao/skia,pcwalton/skia,todotodoo/skia,aosp-mirror/platform_external_skia,nvoron23/skia,Hikari-no-Tenshi/android_external_skia,noselhq/skia,ominux/skia,qrealka/skia-hc,Jichao/skia,HalCanary/skia-hc,noselhq/skia,aosp-mirror/platform_external_skia,nvoron23/skia,nvoron23/skia,Jichao/skia,rubenvb/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,vanish87/skia,shahrzadmn/skia,Hikari-no-Tenshi/android_external_skia,HalCanary/skia-hc