speclint: only show the diff files

Since we moved the specfile into the tempdir so that it can be modified
the final checks are showing all the specfiles even if they pass the
spec cleaner process.

Also don't reset the failed variable.

Fix the argument check for multiple files

Change-Id: I0a7c33f0ce4f31607bb518a2a899a522cdd7fd4c
Signed-off-by: Saul Wold <sgw@linux.intel.com>

tools/spec-tools/speclint.sh

@@ -14,7 +14,7 @@ usage() {
     exit 1
 }
 
-if [ -z $@ ]; then
+if [ ${#@} -eq 0 ]; then
     usage
 fi
 
@@ -84,10 +84,9 @@ for spec in $@; do
 done
 
 # check if some diffs are available
-failed=0
-for specdiff in $tmpdir/*; do
+for specdiff in $tmpdir/*.cleaner.diff; do
     if [ -s "$specdiff" ]; then
-        echo "##### `basename ${specdiff}` ##### "
+        echo "##### `basename ${specdiff} .cleaner.diff` ##### "
         cat $specdiff
         failed=1
     fi