libbe(3): Fix leaky faucets

Amongst them:

• Resource leaks
• Logically dead code
• Unused values
• Null termination issues

Reported by: asomers (pointer to Coverity), Coverity
CID: 1394777, 1394791, 1394830, 1394844, 1394872, 1394894,
CID: 1394900, 1394907, 1394950, 1394965