genksyms: reduce indentation in export_symbol()

Modify this function to return earlier when find_symbol() returns NULL,
reducing the level of improve readability.

No functional changes are intended.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/genksyms/genksyms.c

@@ -632,54 +632,55 @@ static unsigned long expand_and_crc_sym(struct symbol *sym, unsigned long crc)
 void export_symbol(const char *name)
 {
 	struct symbol *sym;
+	unsigned long crc;
+	int has_changed = 0;
 
 	sym = find_symbol(name, SYM_NORMAL, 0);
-	if (!sym)
+	if (!sym) {
 		error_with_pos("export undefined symbol %s", name);
-	else {
-		unsigned long crc;
-		int has_changed = 0;
+		return;
+	}
 
-		if (flag_dump_defs)
-			fprintf(debugfile, "Export %s == <", name);
+	if (flag_dump_defs)
+		fprintf(debugfile, "Export %s == <", name);
 
-		expansion_trail = (struct symbol *)-1L;
+	expansion_trail = (struct symbol *)-1L;
 
-		sym->expansion_trail = expansion_trail;
-		expansion_trail = sym;
-		crc = expand_and_crc_sym(sym, 0xffffffff) ^ 0xffffffff;
+	sym->expansion_trail = expansion_trail;
+	expansion_trail = sym;
+	crc = expand_and_crc_sym(sym, 0xffffffff) ^ 0xffffffff;
 
-		sym = expansion_trail;
-		while (sym != (struct symbol *)-1L) {
-			struct symbol *n = sym->expansion_trail;
+	sym = expansion_trail;
+	while (sym != (struct symbol *)-1L) {
+		struct symbol *n = sym->expansion_trail;
 
-			if (sym->status != STATUS_UNCHANGED) {
-				if (!has_changed) {
-					print_location();
-					fprintf(stderr, "%s: %s: modversion "
-						"changed because of changes "
-						"in ", flag_preserve ? "error" :
-						       "warning", name);
-				} else
-					fprintf(stderr, ", ");
-				print_type_name(sym->type, sym->name);
-				if (sym->status == STATUS_DEFINED)
-					fprintf(stderr, " (became defined)");
-				has_changed = 1;
-				if (flag_preserve)
-					errors++;
+		if (sym->status != STATUS_UNCHANGED) {
+			if (!has_changed) {
+				print_location();
+				fprintf(stderr,
+					"%s: %s: modversion changed because of changes in ",
+					flag_preserve ? "error" : "warning",
+					name);
+			} else {
+				fprintf(stderr, ", ");
 			}
-			sym->expansion_trail = 0;
-			sym = n;
+			print_type_name(sym->type, sym->name);
+			if (sym->status == STATUS_DEFINED)
+				fprintf(stderr, " (became defined)");
+			has_changed = 1;
+			if (flag_preserve)
+				errors++;
 		}
-		if (has_changed)
-			fprintf(stderr, "\n");
+		sym->expansion_trail = 0;
+		sym = n;
+	}
+	if (has_changed)
+		fprintf(stderr, "\n");
 
-		if (flag_dump_defs)
-			fputs(">\n", debugfile);
+	if (flag_dump_defs)
+		fputs(">\n", debugfile);
 
-		printf("#SYMVER %s 0x%08lx\n", name, crc);
-	}
+	printf("#SYMVER %s 0x%08lx\n", name, crc);
 }
 
 /*----------------------------------------------------------------------*/