mke2fs: fix a typo in an error message

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index eb9846a..da4ddac 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -822,7 +822,7 @@
 			if (*p || num_backups > 2) {
 				fprintf(stderr,
 					_("Invalid # of backup "
-					  "superbocks: %s\n"),
+					  "superblocks: %s\n"),
 					arg);
 				r_usage++;
 				continue;