get_maintainer: allow option --mpath <directory> to read all files in <directory>

There is an external use case for multiple private MAINTAINER style files
in a separate directory.  Allow it.

--mpath has a default of "./MAINTAINERS".

The value entered can be either a file or a directory.

The behaviors are now:

--mpath <file>          Read only the specific file as <MAINTAINER_TYPE> file
--mpath <directory>     Read all files in <directory> as <MAINTAINER_TYPE> files
--mpath <directory> --find-maintainer-files
                        Recurse through <directory> and read all files named MAINTAINERS

Link: http://lkml.kernel.org/r/991b2f20112d53863cd79e61d908f1d26d3e1971.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Tested-by: Don Zickus <dzickus@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/get_maintainer.pl

@@ -396,7 +396,12 @@ sub read_all_maintainer_files {
 
     if (-d $path) {
 	$path .= '/' if ($path !~ m@/$@);
-	if ($path eq "${lk_path}MAINTAINERS/") {
+	if ($find_maintainer_files) {
+	    find( { wanted => \&find_is_maintainer_file,
+		    preprocess => \&find_ignore_git,
+		    no_chdir => 1,
+		}, "$path");
+	} else {
 	    opendir(DIR, "$path") or die $!;
 	    my @files = readdir(DIR);
 	    closedir(DIR);
@@ -404,12 +409,6 @@ sub read_all_maintainer_files {
 		push(@mfiles, "$path$file") if ($file !~ /^\./);
 	    }
 	}
-	if ($find_maintainer_files) {
-	    find( { wanted => \&find_is_maintainer_file,
-		    preprocess => \&find_ignore_git,
-		    no_chdir => 1,
-		}, "$path");
-	}
     } elsif (-f "$path") {
 	push(@mfiles, "$path");
     } else {