modpost: allow to pass -i option multiple times to remove -e option

Now that there is no difference between -i and -e, they can be unified.

Make modpost accept the -i option multiple times, then remove -e.

I will reuse -e for a different purpose.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/Makefile.modpost

@@ -50,7 +50,7 @@ MODPOST = scripts/mod/modpost								\
 	$(if $(CONFIG_MODVERSIONS),-m)							\
 	$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a)					\
 	$(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile)					\
-	$(if $(KBUILD_EXTMOD),$(addprefix -e ,$(KBUILD_EXTRA_SYMBOLS)))			\
+	$(if $(KBUILD_EXTMOD),$(addprefix -i ,$(KBUILD_EXTRA_SYMBOLS)))			\
 	$(if $(KBUILD_EXTMOD),-o $(modulesymfile))					\
 	$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E)					\
 	$(if $(KBUILD_MODPOST_WARN),-w)

scripts/mod/modpost.c

@@ -2544,7 +2544,6 @@ int main(int argc, char **argv)
 {
 	struct module *mod;
 	struct buffer buf = { };
-	char *kernel_read = NULL;
 	char *missing_namespace_deps = NULL;
 	char *dump_write = NULL, *files_source = NULL;
 	int opt;
@@ -2553,13 +2552,9 @@ int main(int argc, char **argv)
 	struct ext_sym_list *extsym_start = NULL;
 	struct ext_sym_list **extsym_iter = &extsym_start;
 
-	while ((opt = getopt(argc, argv, "i:e:mnsT:o:awENd:")) != -1) {
+	while ((opt = getopt(argc, argv, "i:mnsT:o:awENd:")) != -1) {
 		switch (opt) {
 		case 'i':
-			kernel_read = optarg;
-			external_module = 1;
-			break;
-		case 'e':
 			external_module = 1;
 			*extsym_iter = NOFAIL(calloc(1, sizeof(**extsym_iter)));
 			(*extsym_iter)->file = optarg;
@@ -2600,8 +2595,6 @@ int main(int argc, char **argv)
 		}
 	}
 
-	if (kernel_read)
-		read_dump(kernel_read);
 	while (extsym_start) {
 		struct ext_sym_list *tmp;