get_maintainer: Improve patch recognition

There are mode change and rename only patches that are unrecognized
by the get_maintainer.pl script.

Recognize them.

[ Linux commit 0455c74788fd5aad4399f00e3fbbb7e87450ca58 ]

Reported-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
CC: Julien Grall <julien.grall@arm.com>
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
Acked-by: Julien Grall <julien.grall@arm.com>

scripts/get_maintainer.pl

@@ -445,7 +445,18 @@ foreach my $file (@ARGV) {
 
 	while (<$patch>) {
 	    my $patch_line = $_;
-	    if (m/^\+\+\+\s+(\S+)/ or m/^---\s+(\S+)/) {
+	    if (m/^ mode change [0-7]+ => [0-7]+ (\S+)\s*$/) {
+		my $filename = $1;
+		push(@files, $filename);
+	    } elsif (m/^rename (?:from|to) (\S+)\s*$/) {
+		my $filename = $1;
+		push(@files, $filename);
+	    } elsif (m/^diff --git a\/(\S+) b\/(\S+)\s*$/) {
+		my $filename1 = $1;
+		my $filename2 = $2;
+		push(@files, $filename1);
+		push(@files, $filename2);
+	    } elsif (m/^\+\+\+\s+(\S+)/ or m/^---\s+(\S+)/) {
 		my $filename = $1;
 		if ($1 ne "/dev/null") { #Ignore the no-file placeholder
 		    $filename =~ s@^[^/]*/@@;