- Don't assign the return value from read(2) to a variable of type   int. - Use errx(3) instead of err(3) to print the error message on short   reads in readlabel(). errno won't be set on short reads which can   easily occur here due to the fixed size read request.
- Don't assign the return value from read(2) to a variable of type
  int.
- Use errx(3) instead of err(3) to print the error message on short
  reads in readlabel(). errno won't be set on short reads which can
  easily occur here due to the fixed size read request.

PR:		144307
Reviewed by:	bde

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase