staging: exfat: replace kmalloc with kmalloc_array

Replace expressions of the form:
	kmalloc(count * size, GFP_KERNEL);
With:
	kmalloc_array(count, size, GFP_KERNEL);
Signed-off-by: Roi Martin <jroi.martin@gmail.com>
Link: https://lore.kernel.org/r/20191031123139.32361-1-jroi.martin@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/exfat/exfat_core.c

@@ -713,8 +713,8 @@ static s32 __load_upcase_table(struct super_block *sb, sector_t sector,
 
 	u32 checksum = 0;
 
-	upcase_table = p_fs->vol_utbl = kmalloc(UTBL_COL_COUNT * sizeof(u16 *),
-						GFP_KERNEL);
+	upcase_table = kmalloc_array(UTBL_COL_COUNT, sizeof(u16 *), GFP_KERNEL);
+	p_fs->vol_utbl = upcase_table;
 	if (!upcase_table)
 		return -ENOMEM;
 	memset(upcase_table, 0, UTBL_COL_COUNT * sizeof(u16 *));
@@ -793,8 +793,8 @@ static s32 __load_default_upcase_table(struct super_block *sb)
 	u16	uni = 0;
 	u16 **upcase_table;
 
-	upcase_table = p_fs->vol_utbl = kmalloc(UTBL_COL_COUNT * sizeof(u16 *),
-						GFP_KERNEL);
+	upcase_table = kmalloc_array(UTBL_COL_COUNT, sizeof(u16 *), GFP_KERNEL);
+	p_fs->vol_utbl = upcase_table;
 	if (!upcase_table)
 		return -ENOMEM;
 	memset(upcase_table, 0, UTBL_COL_COUNT * sizeof(u16 *));