[MIPS] Remove unused argument from kunmap_coherent().

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/mm/cache.c b/arch/mips/mm/cache.c
index 4e8f1b6..abf99b1 100644
--- a/arch/mips/mm/cache.c
+++ b/arch/mips/mm/cache.c
@@ -96,7 +96,7 @@
 
 		kaddr = kmap_coherent(page, vmaddr);
 		flush_data_cache_page((unsigned long)kaddr);
-		kunmap_coherent(kaddr);
+		kunmap_coherent();
 	}
 }