coverity: fix multiple issues (#172)

CIDs involved:
326396 - Constant variable guards deadcode
326345 - Argument cannot be negative
326355 - Infinite loop
326371 - Printf format string issue
328498 - Resource leak
328500 - Unchecked return value
326360 - Explicit null dereference

Signed-off-by: Amar Tumballi <amarts@redhat.com>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>

cli/gluster-block.c

@@ -949,6 +949,10 @@ glusterBlockParseArgs(int count, char **options)
     case GB_CLI_HYPHEN_VERSION:
       MSG(stdout, "%s\n", argp_program_version);
       goto out;
+
+    default:
+      ret = -1;
+      goto out;
     }
   }