tdf#105204: ShellCheck nitpicks for install-gdb-printers

Change-Id: I4d9a9f52d72b789d60e541193fa06dbfb8236ead
SC2155: Declare and assign separately to avoid masking return values.
Reviewed-on: https://gerrit.libreoffice.org/37551Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Chris Sherlock <chris.sherlock79@gmail.com>
Tested-by: Chris Sherlock <chris.sherlock79@gmail.com>

solenv/bin/install-gdb-printers

@@ -55,7 +55,8 @@ make_autoload() {
     local lib="${DESTDIR}${autoloaddir}/$2/$3"
     local merged="$4"
 
-    local resolved="$(readlink "${DESTDIR}${installdir}/$2/$3")"
+    local resolved;
+    resolved=$(readlink "${DESTDIR}${installdir}/$2/$3")
     [ -n "$resolved" ] && lib=$resolved
     local dir="${lib%/*}"