rk: ion: resolve build err

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index d53172eecf1d39d7fed09c5c2fb1dd7cb02c7b39..0fe30de661698c693a466b7f927fbcdbf7d523f8 100755 (executable)
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -116,7 +116,7 @@ struct ion_handle {
        int id;
 };
 
-void ion_iommu_force_unmap(struct ion_buffer *buffer);
+static void ion_iommu_force_unmap(struct ion_buffer *buffer);
 
 bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer)
 {