ARM: 9331/1: ARM/dma-mapping: replace kzalloc() and vzalloc() with kvzalloc()

using kvzalloc() simplifies the code by avoiding the
use of different memory allocation functions for different
situations, making the code more uniform and readable.

Signed-off-by: Chen Haonan <chen.haonan2@zte.com.cn>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

Author: Chen Haonan

arch/arm/mm/dma-mapping.c

@@ -859,10 +859,7 @@ static struct page **__iommu_alloc_buffer(struct device *dev, size_t size,
 	int i = 0;
 	int order_idx = 0;
 
-	if (array_size <= PAGE_SIZE)
-		pages = kzalloc(array_size, GFP_KERNEL);
-	else
-		pages = vzalloc(array_size);
+	pages = kvzalloc(array_size, GFP_KERNEL);
 	if (!pages)
 		return NULL;