remove overhead of adding null byte for snprint()

:Release Notes:
snprintf() family functions will add a null terminating byte, so there is no
need to duplicate that. This commit removes adding of null terminating byte.

:Detailed Notes:

:Testing Performed:
Compile tested pmloglib on local machine

:QA Notes:

:Issues Addressed:
[GF-9403] pmloglib has code which unnecessarily adds null terminating byte

Open-webOS-DCO-1.0-Signed-off-by: Ameya Palande <ameya.palande@lge.com>

Change-Id: I22481fcb8be1d7c6569f5614502a8ee226ad29e0
Reviewed-on: https://g2g.palm.com/2847
Reviewed-by: Build Verification
Reviewed-by: Ameya Palande <ameya.palande@lge.com>
Tested-by: Ameya Palande <ameya.palande@lge.com>
Reviewed-by: Keith Derrick <keith.derrick@lge.com>