shellcheck: Fix SC2045 issue

See,

$ find . -name "*.sh" | xargs shellcheck -i SC2045

In ./roll-tarballs.sh line 220:
for f in $(ls README* 2>/dev/null); do
         ^-----------------------^ SC2045: Iterating over ls output is fragile. Use globs.

For more information:
  https://www.shellcheck.net/wiki/SC2045 -- Iterating over ls output is fragi...

Signed-off-by: Mario Trangoni <mjtrangoni@gmail.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/roll-tarballs.sh b/roll-tarballs.sh
index 85e098960..5d0b7c215 100755
--- a/roll-tarballs.sh
+++ b/roll-tarballs.sh
@@ -217,8 +217,9 @@ rm -Rf "debian/"
 rm -Rf "nx-libs.spec"
 
 # very old release did not add any README
-for f in $(ls README* 2>/dev/null); do
-    mv -v "$f" "doc/";
+for f in README*; do
+    [[ -e "$f" ]] || break # handle the case of no README* files
+    mv -v "$f" "doc/"
 done
 
 # remove files, that we do not want in the tarballs (build cruft)