[PATCH] tools cpupower: Fix signed shift UB in amd_fam14h_idle

[liujing]

From: Liu Jing <liujing@xxxxxxxxxxxxxxxxxxxx>

In amd_fam14h_get_nb_power(), the expression `1 << 31` performs a
signed integer shift, which is undefined behavior in C.

Fix it by using `1U << 31` to perform an unsigned shift.

Signed-off-by: Liu Jing <liujing@xxxxxxxxxxxxxxxxxxxx>
---
--- a/tools/power/cpupower/utils/idle_monitor/amd_fam14h_idle.c
+++ b/tools/power/cpupower/utils/idle_monitor/amd_fam14h_idle.c
@@ -270,7 +270,7 @@
 {
 	uint32_t val;
 	val = pci_read_long(amd_fam14h_pci_dev, PCI_NBP1_CAP_OFFSET);
-	return val & (1 << 31);
+	return val & (1U << 31);
 }
 
 struct cpuidle_monitor *amd_fam14h_register(void)