Fix uninitizlied field in src/pmdas/linux/getinfo.c:get_distro_info()
Fix uninitizlied field in src/pmdas/linux/getinfo.c:get_distro_info()

The st_size field of sbuf was being used to allocate a buffer and
compy data into it, but was uninitialized.

Commit e845fcce3e1b2598f1c499601de3ae3688b0c2a6 removed the call to
stat(3) which had previously initialized this field. This commit
partially reverts that commit.

aeg-aeg/pcpfans,andyvand/cygpcpfans,prasincs/pcp,prasincs/pcp,prasincs/pcp,andyvand/cygpcpfans,tjanez/pcp,edwardt/pcp,wuliming/pcp,edwardt/pcp,tjanez/pcp,adfernandes/pcp,edwardt/pcp,adfernandes/pcp,wuliming/pcp,edwardt/pcp,aeg-aeg/pcpfans,tjanez/pcp,andyvand/cygpcpfans,wuliming/pcp,wuliming/pcp,andyvand/cygpcpfans,aeg-aeg/pcpfans,tjanez/pcp,tjanez/pcp,prasincs/pcp,edwardt/pcp,tjanez/pcp,edwardt/pcp,adfernandes/pcp,edwardt/pcp,prasincs/pcp,adfernandes/pcp,prasincs/pcp,andyvand/cygpcpfans,aeg-aeg/pcpfans,adfernandes/pcp,wuliming/pcp,andyvand/cygpcpfans,wuliming/pcp,edwardt/pcp,andyvand/cygpcpfans,prasincs/pcp,aeg-aeg/pcpfans,adfernandes/pcp,adfernandes/pcp,wuliming/pcp,tjanez/pcp,wuliming/pcp,aeg-aeg/pcpfans,andyvand/cygpcpfans,aeg-aeg/pcpfans,adfernandes/pcp,aeg-aeg/pcpfans,prasincs/pcp,tjanez/pcp