Add the check and judgment statement of malloc return value.

Signed-off-by: Li kunyu <kunyu@nfschina.com>
---
 v2: Remove unlikely() check

 tools/power/cpupower/utils/helpers/misc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/power/cpupower/utils/helpers/misc.c b/tools/power/cpupower/utils/helpers/misc.c
index 36dbd0562240..083d5a6bb74e 100644
--- a/tools/power/cpupower/utils/helpers/misc.c
+++ b/tools/power/cpupower/utils/helpers/misc.c
@@ -139,6 +139,8 @@ void print_online_cpus(void)
 
 	str_len = online_cpus->size * 5;
 	online_cpus_str = malloc(sizeof(char) * str_len);
+	if (!online_cpus_str)
+		return;
 
 	if (!bitmask_isallclear(online_cpus)) {
 		bitmask_displaylist(online_cpus_str, str_len, online_cpus);
@@ -157,6 +159,8 @@ void print_offline_cpus(void)
 
 	str_len = offline_cpus->size * 5;
 	offline_cpus_str = malloc(sizeof(char) * str_len);
+	if (!offline_cpus_str)
+		return;
 
 	if (!bitmask_isallclear(offline_cpus)) {
 		bitmask_displaylist(offline_cpus_str, str_len, offline_cpus);
-- 
2.18.2