GetFSSpace will error when src is not '/'

[0x5457]

Describe the bug
If /dev/sda is mounted under /mnt/sda

when executing fs.GetFSSpace("/mnt/sda") I got the error
wrong df output ...

Environment (please complete the following information):

• Hardware:
• OS: Ubuntu 22.04
• Version: v1.7.0

To Reproduce
executing fs.GetFSSpace("/mnt/sda")

Expected behavior
Expect to return the space size of /dev/sda

Additional context
I think && len(output[0]) == 1 should be removed in thie line

csi-baremetal/pkg/base/linuxutils/fs/fs_helper.go

Line 146 in 89c2f93

if strings.Contains(output[0], src) && len(output[0]) == 1 {