pm: cpupower: bench: Prevent NULL dereference on malloc failure

If malloc returns NULL due to low memory, 'config' pointer can be NULL.
Add a check to prevent NULL dereference.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Zhongqiu Han <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

Author: ZhongqiuHan-Qcom

tools/power/cpupower/bench/parse.c

@@ -121,6 +121,10 @@ FILE *prepare_output(const char *dirname)
 struct config *prepare_default_config()
 {
 	struct config *config = malloc(sizeof(struct config));
+	if (!config) {
+		perror("malloc");
+		return NULL;
+	}
 
 	dprintf("loading defaults\n");