tools:iio:iio_utils: move up reset of sysfsfp

In iioutils_get_type() it is logically better fitting to have sysfsfp
assigned zero right after closing it.
Signed-off-by: NHartmut Knaack <knaack.h@gmx.de>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

tools/iio/iio_utils.c

@@ -175,10 +175,10 @@ int iioutils_get_type(unsigned *is_signed,
 				goto error_free_filename;
 			}
 
+			sysfsfp = 0;
 			free(filename);
 
 			filename = 0;
-			sysfsfp = 0;
 		}
 error_close_sysfsfp:
 	if (sysfsfp)