lparstat: Compile warning cleanups
lparstat: Compile warning cleanups

Clean up compile warnings by adding checks for the return codes from
fgets() calls and adding appropriate error messages.

Signed-off-by: Nathan Fontenot <4b7bfe500077bf77c5456931a34b0b70e36e0bc6@linux.vnet.ibm.com>

shenki/powerpc-utils,shenki/powerpc-utils,shenki/powerpc-utils