add whitespace around PRId64 constants

Avoid string concatenations without interleaving whitespace.
Some compilers don't like "foo""bar", they only like "foo" "bar".

Requested by: Pau
https://gerrit.osmocom.org/c/osmo-hlr/+/12121/5/src/db_hlr.c#637

Change-Id: Ic7a81114f9afbefcbd62d434720854cfdd4a2dd9
4 files changed