Fix C89 compat

Author: squk

fs.c

@@ -8277,14 +8277,16 @@ FS_API fs_bool32 fs_path_is_last(const fs_path_iterator* pIterator)
 
 FS_API int fs_path_iterators_compare(const fs_path_iterator* pIteratorA, const fs_path_iterator* pIteratorB)
 {
+    int cmp;
+
     FS_ASSERT(pIteratorA != NULL);
     FS_ASSERT(pIteratorB != NULL);
 
     if (pIteratorA->pFullPath == pIteratorB->pFullPath && pIteratorA->segmentOffset == pIteratorB->segmentOffset && pIteratorA->segmentLength == pIteratorB->segmentLength) {
         return 0;
     }
 
-    int cmp = fs_strncmp(pIteratorA->pFullPath + pIteratorA->segmentOffset, pIteratorB->pFullPath + pIteratorB->segmentOffset, FS_MIN(pIteratorA->segmentLength, pIteratorB->segmentLength));
+    cmp = fs_strncmp(pIteratorA->pFullPath + pIteratorA->segmentOffset, pIteratorB->pFullPath + pIteratorB->segmentOffset, FS_MIN(pIteratorA->segmentLength, pIteratorB->segmentLength));
     if (cmp != 0) {
         return cmp;
     }