Explicit cast to unsigned int to fix build

Change-Id: Ie4c9b1ec8a8aa4535e71f981937ef373e4ed2d5e
diff --git a/system/GLESv2_enc/GL2Encoder.cpp b/system/GLESv2_enc/GL2Encoder.cpp
index 68d3548..0217ff0 100755
--- a/system/GLESv2_enc/GL2Encoder.cpp
+++ b/system/GLESv2_enc/GL2Encoder.cpp
@@ -1133,7 +1133,7 @@
                     if (buf) {
                         ALOGE("Out of bounds vertex attribute info: "
                                 "clientArray? %d attribute %d vbo %u allocedBufferSize %u bufferDataSpecified? %d wantedStart %u wantedEnd %u",
-                                hasClientArrays, i, bufferObject, buf->m_size, buf != NULL, firstIndex, firstIndex + bufLen);
+                                hasClientArrays, i, bufferObject, (unsigned int)buf->m_size, buf != NULL, firstIndex, firstIndex + bufLen);
                     }
                     m_glDisableVertexAttribArray_enc(this, i);
                 }