msm: kgsl: Return error code when ION setup fails
ion_import_dma_buf() can return a NULL without an error code. Detect
this condition & return a -EINVAL as error.
Change-Id: I18d058fd374a8d00c00bb943f496f446c9f1c90d
Signed-off-by:
Ranjhith Kalisamy <ranjhith@codeaurora.org>
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