efi_loader: loosen buffer parameter check in efi_file_read_int

This is same issue as https://bugzilla.redhat.com/show_bug.cgi?id=1733817,
but that fix was wrongly partial reverted.

When reading a directory, EFI_BUFFER_TOO_SMALL should be returned when
the supplied buffer is too small, so a use-case is to call
EFI_FILE_PROTOCOL.Read() with *buffer_size=0 and buffer=NULL to
obtain the needed size before doing the actual read.

So remove the check only for directory reading, file reading already
do the check by itself.

Fixes: db12f518edb0("efi_loader: implement non-blocking file services")
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefan Sørensen <stefan.sorensen@spectralink.com>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

lib/efi_loader/efi_file.c

@@ -554,7 +554,7 @@ static efi_status_t efi_file_read_int(struct efi_file_handle *this,
 	efi_status_t ret = EFI_SUCCESS;
 	u64 bs;
 
-	if (!this || !buffer_size || !buffer)
+	if (!this || !buffer_size)
 		return EFI_INVALID_PARAMETER;
 
 	bs = *buffer_size;