Adjust awk to not add trailing whitespace.

* mksamplekeys: Tweak awk script to not add trailing whitespace to
  blank lines (makes git pre-commit hook unhappy)

Author: dmshaw

doc/mksamplekeys

@@ -1,11 +1,10 @@
 #/bin/sh
 # Generate a samplekeys.asc
 
-keys='1E42B367 99242560 87978569
-      4F25E3B6 5B0358A2 57548DCD B2D7795E 1CE0C630'
+keys='1E42B367 99242560 87978569 4F25E3B6 5B0358A2 57548DCD B2D7795E 1CE0C630'
 
 for i in $keys; do
-  gpg --list-keys $i | awk ' { print "  " $0 }'
+  gpg --list-keys $i | awk '{ if ( $0 != "") print "  " $0; else print $0; }'
 done
 echo
 gpg --export-options export-minimal --export -a $keys