[RFC][PATCH] libdrm: gralloc_handle.h: Fix build issue with Android

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In trying to integrate the new gralloc_handle.h with the
drm_hwcomposer, I started seeing the following compilation
errors:

In file included from external/drm_hwcomposer/platformdrmgeneric.cpp:28:
external/libdrm/android/gralloc_handle.h:108:9: error: cannot initialize return object of type 'native_handle_t *' (aka 'native_handle *') with an lvalue of type 'struct gralloc_handle_t *'
        return handle;
               ^~~~~~
1 error generated.

This seems to be due to the gralloc_handle_create() definition
claiming to return a native_handle_t * type, rather then a
gralloc_handle_t *, which is what the code actually returns.

This function isn't actually used in the current drm_hwcomposer,
so I'm not totally sure that this fix is correct (rather then
returning the gralloc_handle_t's embadedded native_handle_t ptr).

But it seems something like this is needed.

Cc: Robert Foss <robert.foss@xxxxxxxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Sean Paul <seanpaul@xxxxxxxxxx>
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
---
 android/gralloc_handle.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/android/gralloc_handle.h b/android/gralloc_handle.h
index 9cb5a5d..6e925c9 100644
--- a/android/gralloc_handle.h
+++ b/android/gralloc_handle.h
@@ -84,7 +84,7 @@ static inline struct gralloc_handle_t *gralloc_handle(buffer_handle_t handle)
 /**
  * Create a buffer handle.
  */
-static inline native_handle_t *gralloc_handle_create(int32_t width,
+static inline gralloc_handle_t *gralloc_handle_create(int32_t width,
                                                      int32_t height,
                                                      int32_t hal_format,
                                                      int32_t usage)
@@ -107,5 +107,4 @@ static inline native_handle_t *gralloc_handle_create(int32_t width,
 
 	return handle;
 }
-
 #endif
-- 
2.7.4

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