scripts/kallsyms: remove redundant initializers

These are set to zero without the explicit initializers.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

scripts/kallsyms.c

@@ -57,9 +57,9 @@ static struct addr_range percpu_range = {
 
 static struct sym_entry *table;
 static unsigned int table_size, table_cnt;
-static int all_symbols = 0;
-static int absolute_percpu = 0;
-static int base_relative = 0;
+static int all_symbols;
+static int absolute_percpu;
+static int base_relative;
 
 static int token_profit[0x10000];