BpfNetMaps - minor jni code fixups

(a) jni static methods take 'jclass clazz' as 2nd argument,
while non-static methods take 'jobject this/thiz/self'

(b) use a macro for error handling to remove duplicate code

(c) also fix some whitespace

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I2773617dc7129efb87e28266f97ec3e01a35efc3
1 file changed