ecryptfs log spew from EINTR

[Dave Hansen]

I have a little program that uses mmap() to copy files.  Essentially:

	addr1 = mmap(fd1);
	addr2 = mmap(fd2);
	memcpy(addr1, addr2, len);

If these files are on ecryptfs and I interrupt the memcpy() with ^C, I
consistently get this in dmesg:

ecryptfs_decrypt_page: Error attempting to read lower page; rc = [-4]
ecryptfs_readpage: Error decrypting page; rc = [-4]

-4 is, of course -EINTR because of the ^C.  Should we be suppressing the
message when we see EINTR?
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