zfs-functions.in: is_mounted() always returns 1

The 'while read line; ...; done' loop is run in a piped subshell 
therefore the 'return 0' would not cause a return from the 
is_mounted() function.  In all cases, this function will 
always return 1.

The fix is to 'return 1' from the subshell on a successful match 
(no match == return 0), and then negating the final return value.

Reviewed-by: George Melikov <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: TerraTech <[email protected]>
Closes #8151 

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