Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/gma500/mmu.c:316:20: warning: no previous prototype for 
‘psb_mmu_pt_alloc_map_lock’ [-Wmissing-prototypes]

Cc: Patrik Jakobsson <patrik.r.jakobs...@gmail.com>
Cc: David Airlie <airl...@linux.ie>
Cc: Daniel Vetter <dan...@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jo...@linaro.org>
---
 drivers/gpu/drm/gma500/mmu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/gma500/mmu.c b/drivers/gpu/drm/gma500/mmu.c
index 505044c9a6732..42b53c01b79f4 100644
--- a/drivers/gpu/drm/gma500/mmu.c
+++ b/drivers/gpu/drm/gma500/mmu.c
@@ -313,8 +313,8 @@ static struct psb_mmu_pt *psb_mmu_alloc_pt(struct 
psb_mmu_pd *pd)
        return pt;
 }
 
-struct psb_mmu_pt *psb_mmu_pt_alloc_map_lock(struct psb_mmu_pd *pd,
-                                            unsigned long addr)
+static struct psb_mmu_pt *psb_mmu_pt_alloc_map_lock(struct psb_mmu_pd *pd,
+                                                   unsigned long addr)
 {
        uint32_t index = psb_mmu_pd_index(addr);
        struct psb_mmu_pt *pt;
-- 
2.25.1

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