Removed warnings from idmapd.c

Removed warnings from idmapd.c

idmapd.c:120: warning: missing initializer
idmapd.c:120: warning: (near initialization for 'nfsd_ic[0].ic_event')
idmapd.c:121: warning: missing initializer
idmapd.c:121: warning: (near initialization for 'nfsd_ic[1].ic_event')
idmapd.c: In function 'flush_nfsd_cache':
idmapd.c:173: warning: comparison between signed and unsigned integer expressions
idmapd.c: In function 'dirscancb':
idmapd.c:384: warning: unused parameter 'fd'
idmapd.c:384: warning: unused parameter 'which'
idmapd.c: In function 'svrreopen':
idmapd.c:468: warning: unused parameter 'fd'
idmapd.c:468: warning: unused parameter 'which'
idmapd.c:468: warning: unused parameter 'data'
idmapd.c: In function 'clntscancb':
idmapd.c:474: warning: unused parameter 'fd'
idmapd.c:474: warning: unused parameter 'which'
idmapd.c: In function 'nfsdcb':
idmapd.c:488: warning: unused parameter 'fd'
idmapd.c: In function 'nfscb':
idmapd.c:663: warning: unused parameter 'fd'
idmapd.c: In function 'validateascii':
idmapd.c:850: warning: comparison between signed and unsigned integer expressions
idmapd.c:858: warning: comparison between signed and unsigned integer expressions
idmapd.c: In function 'getfield':
idmapd.c:916: warning: comparison between signed and unsigned integer expressions

Signed-off-by: Steve Dickson <steved@redhat.com>