TT#9718 Fix shellcheck v.0.3.4-3 warning

Shellcheck v.0.3.4-3 is default for jessie and installed
on jenkins CI. It produces fake alarm here, while shellcheck
v.0.3.7-5+ reports no issues here. Fixing warning to make it happy:

In deployment.sh line 1753:
  find "${TARGET}/var/log" -type f -size +0 -not -name \*.ini -exec sh -c ':> ${1}' sh {} \;
                                                                          ^-- SC2016: Expressions don't expand in single quotes, use double quotes for that.

Change-Id: I75cd28dacacc65dfdb6b7fd134b8f3c727b1b48d

deployment.sh

@@ -1750,7 +1750,7 @@ EOT
   done
 
   # nuke files
-  find "${TARGET}/var/log" -type f -size +0 -not -name \*.ini -exec sh -c ':> ${1}' sh {} \;
+  find "${TARGET}/var/log" -type f -size +0 -not -name \*.ini -exec sh -c ":> \${1}" sh {} \;
   :>$TARGET/var/run/utmp
   :>$TARGET/var/run/wtmp