Checks link status of program before returning attribute locations.
TRAC #11658
Signed-off-by: Andrew Lewycky
Signed-off-by: Daniel Koch

Author:    Shannon Woods

git-svn-id: https://angleproject.googlecode.com/svn/trunk@130 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/libGLESv2.cpp b/src/libGLESv2/libGLESv2.cpp
index 7f1dc31..ea0039d 100644
--- a/src/libGLESv2/libGLESv2.cpp
+++ b/src/libGLESv2/libGLESv2.cpp
@@ -1756,6 +1756,11 @@
                 }
             }
 
+            if (!programObject->isLinked())
+            {
+                return error(GL_INVALID_OPERATION, -1);
+            }
+
             return programObject->getAttributeLocation(name);
         }
     }