fix parted of "missing for discarded return value"

MISRA C required that return value should be used, missing for it should
add "(void)" prefix before the function call.
Some function can be declared without return value to avoid this problem.

Signed-off-by: Huihuang Shi <huihuang.shi@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/common/hv_main.c

@@ -141,7 +141,7 @@ int hv_main(int cpu_id)
 	return 0;
 }
 
-int get_vmexit_profile(char *str, int str_max)
+void get_vmexit_profile(char *str, int str_max)
 {
 	int cpu, i, len, size = str_max;
 
@@ -173,5 +173,4 @@ int get_vmexit_profile(char *str, int str_max)
 		}
 	}
 	snprintf(str, size, "\r\n");
-	return 0;
 }