[PATCH] 415 vlock accepts any passwd when using shadow

[Tito]

Hi,
This fixes bug 415  vlock accepts any passwd when using shadow.
The bug was due to an incorrect use of sizeof and seems to be there
from the very first Revision 4961 in svn
It was doing something like:
	char *crypt_pass;
        if (strncmp(/*crypt_pass*/            $1$JM5uGtk7$.NXBAttjSBinwpljyHpm3 , 
                              /*pw->pw_passwd*/ $1$JM5diUnj$2sdZPvwJe9LOs/hHQXALL.
                              /*sizeof(crypt_pass)*/ 4) == 0) {
         
          $1$J  ==  $1$J

	Always  true.
                 
The patch is trivial and tested.
Please apply.

Ciao,
Tito
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