logcat: error on multiple PID argument

Since they are dropped.

Bug: N/A
Test: manual try w/ 1 and 2 --pid arguments
Change-Id: I5945c12dc080a8c046b8071106f7d87ecb2b018c
1 file changed
tree: 4f96f8e2fde57c373c4903696f41c253076cbde4
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/