FM: jni: Treat only negative return values as errors

FM kernel driver can return zero or positive
values in case of success. Make changes to treat
only negative return values as errors.

Change-Id: Ief859af604349a2e47daee18693723600154d1a9
1 file changed
tree: a955525a5f6b5fcce2a33b8367447354e8948d33
  1. fmapp/
  2. fmapp2/
  3. FMRecord/
  4. jni/
  5. qcom/
  6. Android.mk