[patch] i915: missing unlock on error path

[Dan Carpenter <error27@gmail.com>]

There was a missing mutex_unlock(&dev->struct_mutex) on this error path.

Signed-off-by: Dan Carpenter <error27@gmail.com>
---
I thought Jiri sent this patch earlier but a google search for "stanse
struct_mutex i965_reset" didn't find any patches, so I'm resending.

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 01e91ea..a605c87 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -369,6 +369,7 @@ int i965_reset(struct drm_device *dev, u8 flags)
 		}
 	} else {
 		DRM_ERROR("Error occurred. Don't know how to reset this chip.\n");
+		mutex_unlock(&dev->struct_mutex);
 		return -ENODEV;
 	}
 

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