makefile: add missing semicolons

On some distributions, as Debian GNU 11, this targets fails
with errors.

Signed-off-by: Angelo Dureghello <angelo.dureghello@timesys.com>
diff --git a/Makefile b/Makefile
index 0220e8d..5064996 100644
--- a/Makefile
+++ b/Makefile
@@ -1246,7 +1246,7 @@
 			echo "u-boot.map shows a binary size of $$map_size" >&2 ; \
 			echo "  but u-boot-nodtb.bin shows $$file_size" >&2 ; \
 			exit 1; \
-		fi \
+		fi; \
 	fi
 
 ifeq ($(CONFIG_INIT_SP_RELATIVE)$(CONFIG_OF_SEPARATE),yy)