Fix potental memory leak (compiler warning).

This CL fixes the following warning:

EffectProxy.cpp:93:8: warning: Potential leak of memory pointed to by
'pContext'.

BUG=None
Test: WITH_TIDY=1 WITH_STATIC_ANLYZER=1 mm

Change-Id: I7f127042eb50d3d6297473bfd90a5402b182cc85
diff --git a/media/libeffects/proxy/EffectProxy.cpp b/media/libeffects/proxy/EffectProxy.cpp
index 62d3fd3..7f777e7 100644
--- a/media/libeffects/proxy/EffectProxy.cpp
+++ b/media/libeffects/proxy/EffectProxy.cpp
@@ -91,6 +91,7 @@
        delete[] pContext->sube;
        delete[] pContext->desc;
        delete[] pContext->aeli;
+       delete pContext;
        return -EINVAL;
     }
     // Check which is the HW descriptor and copy the descriptors