nbd: please don't spawn 16 threads when nbd is not even in use

[Pavel Machek]

Hi!

I see this... and it looks like there are 16 workqueues before nbd is
even used. Surely there are better ways to do that?

Best regards,
								Pavel

    257 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd0-recv                                              
    260 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd1-recv                                              
    263 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd2-recv                                              
    266 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd3-recv                                              
    269 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd4-recv                                              
    272 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd5-recv                                              
    275 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd6-recv                                              
    278 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd7-recv                                              
    281 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd8-recv                                              
    284 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd9-recv                                              
    287 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd10-recv                                             
    290 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd11-recv                                             
    293 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd12-recv                                             
    296 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd13-recv                                             
    299 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd14-recv                                             
    302 root       0 -20       0      0      0 I   0.0   0.0   0:00.00 nbd15-recv                                             


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