kbuild: remove trailing semicolon from cmd_* passed to if_changed_rule

With the change of rule_cc_o_c / rule_as_o_S in the last commit, each
command is executed in a separate subshell. Rip off unneeded semicolons.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 6bbbe75..ba297fd 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -261,7 +261,7 @@
 cmd_and_fixdep =                                                             \
 	$(cmd);                                                              \
 	scripts/basic/fixdep $(depfile) $@ '$(make-cmd)' > $(dot-target).cmd;\
-	rm -f $(depfile);
+	rm -f $(depfile)
 
 # Usage: $(call if_changed_rule,foo)
 # Will check if $(cmd_foo) or any of the prerequisites changed,