[PATCH] dma-buf: fix build due to missing export

[Lucas De Marchi <lucas.demarchi@xxxxxxxxx>]

Commit 0c6b522abc2a ("dma-buf: cleanup dma-resv shared fence debugging a bit v2")
turned dma_resv_reset_shared_max() into a function when
CONFIG_DEBUG_MUTEXES is set, but forgot to export it. That resulted in a
broken build:

	ERROR: modpost: "dma_resv_reset_shared_max" [drivers/gpu/drm/vgem/vgem.ko] undefined!
	ERROR: modpost: "dma_resv_reset_shared_max" [drivers/gpu/drm/i915/i915.ko] undefined!
	ERROR: modpost: "dma_resv_reset_shared_max" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!
	ERROR: modpost: "dma_resv_reset_shared_max" [drivers/gpu/drm/ttm/ttm.ko] undefined!
	ERROR: modpost: "dma_resv_reset_shared_max" [drivers/gpu/drm/drm.ko] undefined!
	ERROR: modpost: "dma_resv_reset_shared_max" [drivers/gpu/drm/drm_vram_helper.ko] undefined!
	make[1]: *** [scripts/Makefile.modpost:150: modules-only.symvers] Error 1

Fixes: 0c6b522abc2a ("dma-buf: cleanup dma-resv shared fence debugging a bit v2")
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
Cc: "Christian König" <christian.koenig@xxxxxxx>
Cc: linux-media@xxxxxxxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: linaro-mm-sig@xxxxxxxxxxxxxxxx
Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
---
 drivers/dma-buf/dma-resv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 3964df438505..6132ba631991 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -226,6 +226,7 @@ void dma_resv_reset_shared_max(struct dma_resv *obj)
 		fence->shared_max = fence->shared_count;
 	}
 }
+EXPORT_SYMBOL(dma_resv_reset_shared_max);
 #endif
 
 /**
-- 
2.31.1