bug: fix assign vfsmnt correctly #9666

Job	Run time
Build tetragon	7m 35s
Test kernel 4.19-20241218.004849 / test group 0	24m 27s
Test kernel 5.10-20241218.004849 / test group 0	35m 22s
Test kernel 5.15-20241218.004849 / test group 0	35m 34s
Test kernel 5.4-20241218.004849 / test group 0	30m 51s
Test kernel 6.1-20241218.004849 / test group 0	29m 25s
Test kernel 6.6-20241218.004849 / test group 0	31m 49s
Test kernel bpf-next-20241226.013307 / test group 0	32m 21s
Test kernel rhel8.9-20240806.173325 / test group 0	29m 46s
post-test	2s
	4h 17m 12s

Provide feedback