relocation: Mark methods as staticmethod

A method expects `self` as the first argument; they are all functions.

Signed-off-by: Philipp Hahn <phahn-oss@avm.de>

elftools/elf/relocation.py

@@ -340,27 +340,35 @@ def _do_apply_relocation(self, stream, reloc, symtab):
     _RELOCATION_RECIPE_TYPE = namedtuple('_RELOCATION_RECIPE_TYPE',
         'bytesize has_addend calc_func')
 
+    @staticmethod
     def _reloc_calc_identity(value, sym_value, offset, addend=0):
         return value
 
+    @staticmethod
     def _reloc_calc_sym_plus_value(value, sym_value, offset, addend=0):
         return sym_value + value + addend
 
+    @staticmethod
     def _reloc_calc_sym_plus_value_pcrel(value, sym_value, offset, addend=0):
         return sym_value + value - offset
 
+    @staticmethod
     def _reloc_calc_sym_plus_addend(value, sym_value, offset, addend=0):
         return sym_value + addend
 
+    @staticmethod
     def _reloc_calc_sym_plus_addend_pcrel(value, sym_value, offset, addend=0):
         return sym_value + addend - offset
 
+    @staticmethod
     def _reloc_calc_value_minus_sym_addend(value, sym_value, offset, addend=0):
         return value - sym_value - addend
 
+    @staticmethod
     def _arm_reloc_calc_sym_plus_value_pcrel(value, sym_value, offset, addend=0):
         return sym_value // 4 + value - offset // 4
 
+    @staticmethod
     def _bpf_64_32_reloc_calc_sym_plus_addend(value, sym_value, offset, addend=0):
         return (sym_value + addend) // 8 - 1