cmd_nand: drop duplicate NULL ptr check

The first if statement checks for NULL ptrs, so there is no need to check
it again in later else cases (such as .oob).

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
CC: Scott Wood <scottwood@freescale.com>

common/cmd_nand.c

@@ -390,7 +390,7 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 			else
 				ret = nand_write_skip_bad(nand, off, &size,
 							  (u_char *)addr);
-		} else if (s != NULL && !strcmp(s, ".oob")) {
+		} else if (!strcmp(s, ".oob")) {
 			/* out-of-band data */
 			mtd_oob_ops_t ops = {
 				.oobbuf = (u8 *)addr,