[COVERITY] Fix memory leak in libe2p (e2p_edit_mntopts)

Need to free memory allocated to buf.

Coverity ID: 17: Resource Leak
Coverity ID: 18: Resource Leak

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2 files changed