Add absent \n at the end of the help text line

Signed-off-by: Brian Behlendorf <[email protected]>
Issue #1545

cmd/zdb/zdb.c

@@ -164,7 +164,7 @@ usage(void)
 	(void) fprintf(stderr, "        -t <txg> -- highest txg to use when "
 	    "searching for uberblocks\n");
 	(void) fprintf(stderr, "        -M <number of inflight I/Os> -- "
-	    "specify the maximum number of checksumming I/Os [default is 200]");
+	    "specify the maximum number of checksumming I/Os [default is 200]\n");
 	(void) fprintf(stderr, "Specify an option more than once (e.g. -bb) "
 	    "to make only that option verbose\n");
 	(void) fprintf(stderr, "Default is to dump everything non-verbosely\n");