[MIPS] IP27: Add missing ~ in DMA code.

Harmless since this function is not being called on I/O coherent systems
such as IP27.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/include/asm-mips/mach-ip27/dma-coherence.h b/include/asm-mips/mach-ip27/dma-coherence.h
index 3fdbbf6..ed7e622 100644
--- a/include/asm-mips/mach-ip27/dma-coherence.h
+++ b/include/asm-mips/mach-ip27/dma-coherence.h
@@ -35,7 +35,7 @@
 
 static unsigned long plat_dma_addr_to_phys(dma_addr_t dma_addr)
 {
-	return dma_addr & (0xffUL << 56);
+	return dma_addr & ~(0xffUL << 56);
 }
 
 static inline void plat_unmap_dma_mem(dma_addr_t dma_addr)