GitLab

When executing the code "git show-ref -s --abbrev --tags $tag" and the
output spans multiple lines, it results in generation of a directory
in the kernel objects causing build failure.

Ex:

$ git show-ref -s --abbrev --tags LNX.LA.3.2-00520-8x26
04163f5
04163f5

Results in:

"ln: target `04163f5-00951-g2403ab9/source' is not a directory"

Fix this by pruning anything after the first line of output.

Change-Id: Iebe1e6fa88951ec0f1dab383adeb6faa72872295
Signed-off-by: Jason Hrycay <jason.hrycay@motorola.com>