checkpatch: correct spelling in kfree checks

Correct spelling in the kfree reports.
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -2075,7 +2075,7 @@ sub process {
 		if ($prevline =~ /\bif\s*\(([^\)]*)\)/) {
 			my $expr = $1;
 			if ($line =~ /\bkfree\(\Q$expr\E\);/) {
-				WARN("kfree(NULL) is safe this check is probabally not required\n" . $hereprev);
+				WARN("kfree(NULL) is safe this check is probably not required\n" . $hereprev);
 			}
 		}
 # check for needless usb_free_urb() checks