fix typo in bash expression
Fortunately the error doesn't change the value of the expression
(since undefined variables are treated as 0 inside "$((...))").
diff --git a/core/definitions.mk b/core/definitions.mk
index 3f8ab88..9b3a03d 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -1589,7 +1589,7 @@
if [ "$(3)" == "yaffs" ]; then \
reservedblocks=5; \
else \
- reselvedblocks=0; \
+ reservedblocks=0; \
fi; \
twoblocks=$$((img_blocksize * 2)); \
onepct=$$((((($(2) / 100) - 1) / img_blocksize + 1) * img_blocksize)); \