arm64/mpam: add return value check for acpi_get_table()

openEuler inclusion
category: bugfix
bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=339
CVE: NA
Reference: https://gitee.com/openeuler/kernel/issues/I3U11D

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This fix check return value of acpi_get_table().

MPAM driver need to check return value, thus we need to check
the return value of acpi_get_table(ACPI_SIG_PPTT, 0, &pptt).
Signed-off-by: Nmpiglet <mpiglet@outlook.com>
Reviewed-by: Jian Cheng <cj.chengjian(a)huawei.com>
Signed-off-by: NWang ShaoBo <bobo.shaobowang@huawei.com>

drivers/acpi/arm64/mpam.c

@@ -255,7 +255,7 @@ int __init acpi_mpam_parse(void)
 		return -ENOENT;
 
 	/* PPTT is optional, there may be no mpam cache controls */
-	acpi_get_table(ACPI_SIG_PPTT, 0, &pptt);
+	status = acpi_get_table(ACPI_SIG_PPTT, 0, &pptt);
 	if (ACPI_FAILURE(status))
 		pptt = NULL;