fix: return boot time from stat file

add missing return statement for boot time value retrieved from stat file. Also move current time fetch to be closer to where the "time since boot file" is read

internal/common/common_linux.go

@@ -90,13 +90,17 @@ func BootTimeWithContext(ctx context.Context, enableCache bool) (uint64, error)
 		if enableCache {
 			atomic.StoreUint64(&cachedBootTime, t)
 		}
+
+		return t, nil
 	}
 
 	filename := HostProcWithContext(ctx, "uptime")
 	lines, err := ReadLines(filename)
 	if err != nil {
 		return handleBootTimeFileReadErr(err)
 	}
+	currentTime := float64(time.Now().UnixNano()) / float64(time.Second)
+
 	if len(lines) != 1 {
 		return 0, fmt.Errorf("wrong uptime format")
 	}
@@ -105,7 +109,6 @@ func BootTimeWithContext(ctx context.Context, enableCache bool) (uint64, error)
 	if err != nil {
 		return 0, err
 	}
-	currentTime := float64(time.Now().UnixNano()) / float64(time.Second)
 	t := currentTime - b
 
 	if enableCache {