lib: Fix probe extension

The break statement is missing in base extension function handling.

Fix the typo.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Xiang Wang <merle@hardenedlinux.org>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

lib/sbi/sbi_ecall.c

@@ -103,6 +103,7 @@ int sbi_ecall_base_handler(struct sbi_scratch *scratch,
 		break;
 	case SBI_EXT_BASE_PROBE_EXT:
 		ret = sbi_check_extension(scratch, args[0], out_val);
+		break;
 	default:
 		ret = SBI_ENOTSUPP;
 	}