Report debuginfo size in kilobytes

By standard, 'du' defaults to 512 byte units, but this differs between
implementations: GNU du defaults to 1024 unless POSIXLY_CORRECT is set
and also allows overriding via number of environment variables. It also
supports various other ways of controlling the block size, but the
only standard means to control the size is -k, and we really don't
want to break portability for the sake of FYI statistics.

Inspired by Marxim Liska's patch at in #554.

scripts/find-debuginfo.sh

@@ -486,7 +486,7 @@ if $run_dwz \
    && [ -d "${RPM_BUILD_ROOT}/usr/lib/debug" ]; then
   readarray dwz_files < <(cd "${RPM_BUILD_ROOT}/usr/lib/debug"; find -type f -name \*.debug | LC_ALL=C sort)
   if [ ${#dwz_files[@]} -gt 0 ]; then
-    size_before=$(du -s ${RPM_BUILD_ROOT}/usr/lib/debug | cut -f1)
+    size_before=$(du -sk ${RPM_BUILD_ROOT}/usr/lib/debug | cut -f1)
     dwz_multifile_name="${RPM_PACKAGE_NAME}-${RPM_PACKAGE_VERSION}-${RPM_PACKAGE_RELEASE}.${RPM_ARCH}"
     dwz_multifile_suffix=
     dwz_multifile_idx=0
@@ -509,8 +509,8 @@ if $run_dwz \
       echo >&2 "*** ERROR: DWARF compression requested, but no dwz installed"
       exit 2
     fi
-    size_after=$(du -s ${RPM_BUILD_ROOT}/usr/lib/debug | cut -f1)
-    echo "original debug info size: ${size_before}, size after compression: ${size_after}"
+    size_after=$(du -sk ${RPM_BUILD_ROOT}/usr/lib/debug | cut -f1)
+    echo "original debug info size: ${size_before}kB, size after compression: ${size_after}kB"
     # Remove .dwz directory if empty
     rmdir "${RPM_BUILD_ROOT}/usr/lib/debug/.dwz" 2>/dev/null
     if [ -f "${RPM_BUILD_ROOT}/usr/lib/debug/.dwz/${dwz_multifile_name}" ]; then