[ELF] Remove unneeded null check in getRelocatedSection. NFC

Author: MaskRay

lld/ELF/InputSection.cpp

@@ -316,7 +316,9 @@ InputSection::InputSection(InputFile *f, uint64_t flags, uint32_t type,
                            StringRef name, Kind k)
     : InputSectionBase(f, flags, type,
                        /*Entsize*/ 0, /*Link*/ 0, /*Info*/ 0, addralign, data,
-                       name, k) {}
+                       name, k) {
+  assert(f || this == &InputSection::discarded);
+}
 
 template <class ELFT>
 InputSection::InputSection(ObjFile<ELFT> &f, const typename ELFT::Shdr &header,
@@ -346,7 +348,7 @@ template <class ELFT> void InputSection::copyShtGroup(uint8_t *buf) {
 }
 
 InputSectionBase *InputSection::getRelocatedSection() const {
-  if (!file || file->isInternal() || (type != SHT_RELA && type != SHT_REL))
+  if (file->isInternal() || (type != SHT_RELA && type != SHT_REL))
     return nullptr;
   ArrayRef<InputSectionBase *> sections = file->getSections();
   return sections[info];