arm64: Use bool function return values of true/false not 1/0

Use the normal return values for bool functions
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>

arch/arm64/include/asm/dma-mapping.h

@@ -97,7 +97,7 @@ static inline int dma_set_mask(struct device *dev, u64 mask)
 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 {
 	if (!dev->dma_mask)
-		return 0;
+		return false;
 
 	return addr + size - 1 <= *dev->dma_mask;
 }