avoid useless assignment if not needed

diff --git a/src/lib/cpu.c b/src/lib/cpu.c
index ac70e39..9fb389b 100644 (file)
--- a/src/lib/cpu.c
+++ b/src/lib/cpu.c
@@ -64,7 +64,7 @@ static double get_usage()
        glibtop_cpu cpu;
        unsigned long int used;
        unsigned long int dt;
-       double cpu_rate = UNKNOWN_DBL_VALUE;
+       double cpu_rate;
 
        glibtop_get_cpu(&cpu);
 
@@ -74,6 +74,8 @@ static double get_usage()
 
        if (dt)
                cpu_rate = 100 * (used - last_used) / dt;
+       else
+               cpu_rate = UNKNOWN_DBL_VALUE;
 
        last_used = used;
        last_total = cpu.total;