Fix unmatch close function call

If HAVE_MMAP is not set, the open and close file operations use the
standard C library interface, so fclose should be used instead of the
close system call.

src/elf.c

@@ -353,7 +353,7 @@ bool elf_open(elf_t *e, const char *input)
 #if HAVE_MMAP
     close(fd);
 #else
-    close(f);
+    fclose(f);
 #endif
 
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