[stgt] [PATCH] Fix warnings when compiling iSCSI with gcc 4.3.3 on arm

[Pete Batard]

I have been seeing the following warnings during compilation on arm. 
Please find a small patch to address them:

------------------------------------------------------------------------
iscsi/iscsid.c: In function 'iscsi_transportid':
iscsi/iscsid.c:2289: warning: format not a string literal and no format 
arguments

iscsi/isns.c: In function 'print_scn_pdu':
iscsi/isns.c:571: warning: format not a string literal and no format 
arguments
iscsi/isns.c:571: warning: format not a string literal and no format 
arguments

tgtd.c: In function 'run_ext_program':
tgtd.c:292: warning: ignoring return value of 'write', declared with 
attribute warn_unused_result

tgtimg.c: In function 'sbc_new':
tgtimg.c:453: warning: ignoring return value of 'pwrite', declared with 
attribute warn_unused_result
------------------------------------------------------------------------

Another approach for the last 2 fixes would be of course to check the 
return value of write/pwrite.

Regards,

/Pete
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