export_report: do collectcfiles work in perl itself

Avoid spawning a shell pipeline doing cat, grep, sed, and do it all
inside perl. The <*.c> globbing construct works at least as far back
as 5.8.9

Note that this is not just an optimization; the sed command
in the pipeline was unterminated, due to lack of escape on the
end-of-line (\$) in the regex, resulting in this:

$ perl ../linux-2.6/scripts/export_report.pl > /dev/null
sed: -e expression #1, char 5: unterminated `s' command
sh: .mod.c/: not found

Comments on an earlier patch sought an all-perl implementation.

Signed-off-by: Jim Cromie <[e-mail]>
cc: Michal Marek <[e-mail]>,
cc: [e-mail]
cc: Arnaud Lacombe [e-mail]
cc: Stephen Hemminger [e-mail]
Signed-off-by: Michal Marek <[e-mail]>

scripts/export_report.pl

···
 }
 
 sub collectcfiles {
-    my @file
-	= `cat .tmp_versions/*.mod | grep '.*\.ko\$' | sed s/\.ko$/.mod.c/`;
+    my @file;
+    while (<.tmp_versions/*.mod>) {
+	open my $fh, '<', $_ or die "cannot open $_: $!\n";
+	push (@file,
+	      grep s/\.ko/.mod.c/,	# change the suffix
+	      grep m/.+\.ko/,		# find the .ko path
+	      <$fh>);			# lines in opened file
+    }
     chomp @file;
     return @file;
 }