find-provides.ksyms, find-requires.ksyms: avoid calling nm twice
    
    Instead of running the nm output through grep and then running it
    through awk again, run it directly through awk, and bail of immediately
    if a non-absolute symbol is found.
    
    Also, while we're here, avoid executing the indirect parsing code
    if no __crc_* symbols are present at all, which shaves around 8-18% off
    of the run time:
    
        % for i in ./lib/modules/*; do \
            echo "====== $i ====="; \
            diff -u <(find $i | ./find-provides.ksyms.old) <(find $i | ./find-provides.ksyms.new); \
            echo old:; find $i | time ./find-provides.ksyms.old > /dev/null; \
            echo new:; find $i | time ./find-provides.ksyms.new > /dev/null; \
        done
        ====== ./lib/modules/4.18.0-372.57.1.el8_6.s390x =====
        old: ../find-provides.ksyms.old > /dev/null  5.10s user 4.52s system 150% cpu 6.412 total
        new: ../find-provides.ksyms.new > /dev/null  4.41s user 3.48s system 136% cpu 5.764 total
        ====== ./lib/modules/4.18.0-372.57.1.el8_6.x86_64 =====
        old: ../find-provides.ksyms.old > /dev/null  7.80s user 6.19s system 143% cpu 9.740 total
        new: ../find-provides.ksyms.new > /dev/null  6.07s user 3.97s system 124% cpu 8.066 total
        ====== ./lib/modules/5.14.0-284.15.1.el9_2.s390x =====
        old: ../find-provides.ksyms.old > /dev/null  5.87s user 4.35s system 143% cpu 7.113 total
        new: ../find-provides.ksyms.new > /dev/null  5.12s user 3.56s system 132% cpu 6.533 total
        ====== ./lib/modules/5.14.0-284.15.1.el9_2.x86_64 =====
        old: ../find-provides.ksyms.old > /dev/null  8.44s user 6.78s system 144% cpu 10.535 total
        new: ../find-provides.ksyms.new > /dev/null  6.55s user 4.17s system 123% cpu 8.666 total
        ====== ./lib/modules/6.4.0-0.rc1.20230511git80e62bc8487b.19.eln126.s390x =====
        old: ../find-provides.ksyms.old > /dev/null  5.04s user 3.95s system 145% cpu 6.166 total
        new: ../find-provides.ksyms.new > /dev/null  4.64s user 3.17s system 136% cpu 5.719 total
        ====== ./lib/modules/6.4.0-0.rc1.20230511git80e62bc8487b.19.eln126.x86_64 =====
        old: ../find-provides.ksyms.old > /dev/null  8.49s user 5.54s system 139% cpu 10.043 total
        new: ../find-provides.ksyms.new > /dev/null  7.41s user 4.31s system 129% cpu 9.046 total
    
    * find-provides.ksyms: Rewrite the "if nm | grep -q; then nm | awk"
    with straight "nm | awk", update the awk script to return the exit code
    accordingly, execute indirect symbol parsing only if inderect __crc_*
    symbols are present.
    * find-requires.ksyms (all_provides): Likewise.
    
    Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>