unnecessary call throwing errors

[wenzowski]

Somehow it appears that call is becoming unbound, resulting in errors being thrown by defaultResolveFn.

Why not just call the function directly?

Affects mattkrick/meatier#123 and trace can be seen on ci

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[coveralls]

Coverage remained the same at 99.418% when pulling 2cfe490 on wenzowski:master into 3f6a7f4 on graphql:master.

[wenzowski]

This doesn't have a CLA Signed tag yet, but I completed the form.

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[leebyron]

Thanks!

[leebyron]

Oh wait, actually - I'm going to revert this and fix in another way and add tests. The first argument to call is the this context, not the first argument, so this change is not equivalent.