Avoid a tautological bitwise compare.

This looks like a bit of debugging code that sliped into the initial
import of the new ATA framework. This changes the behavior to omit a
line of output that appears to have been intended for omission.

Reviewed by:	mav
MFC after:	3 days
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D22845

sys/dev/ata/chipsets/ata-promise.c

@@ -795,7 +795,7 @@ ata_promise_mio_reset(device_t dev)
 	    if (ata_sata_phy_reset(dev, -1, 1)) {
 		u_int32_t signature = ch->hw.softreset(dev, ATA_PM);
 
-		if (1 | bootverbose)
+		if (bootverbose)
         	    device_printf(dev, "SIGNATURE: %08x\n", signature);
 
 		switch (signature >> 16) {