Release mutex_lock if mIO.init failed during ContextCreate.

Bug: 38355404
Test: mm and boot sailfish
Change-Id: I0c5b2dfd6572edeccd929db0edc8b51e854896f0
diff --git a/rsContext.cpp b/rsContext.cpp
index cc6f6de..f6686a9 100644
--- a/rsContext.cpp
+++ b/rsContext.cpp
@@ -491,6 +491,7 @@
 
     if (!mIO.init()) {
         ALOGE("Failed initializing IO Fifo");
+        pthread_mutex_unlock(&gInitMutex);
         return false;
     }
     mIO.setTimeoutCallback(printWatchdogInfo, this, 2e9);