silence compiler warning because of different signedness

../../patchelf/src/patchelf.cc:835:19: warning: comparison of integer expressions of different signedness: 'long long unsigned int' and 'off_t' {aka 'long long int'} [-Wsign-compare]
  835 |     assert(curOff == startOffset + neededSpace);
      |            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

Author: DerDakon

src/patchelf.cc

@@ -803,7 +803,7 @@ void ElfFile<ElfFileParamNames>::rewriteSectionsLibrary()
         neededSpace += roundUp(i.second.size(), sectionAlignment);
     debug("needed space is %d\n", neededSpace);
 
-    size_t startOffset = roundUp(fileContents->size(), getPageSize());
+    Elf_Off startOffset = roundUp(fileContents->size(), getPageSize());
 
     growFile(fileContents, startOffset + neededSpace);