FreeBSD/src 9f07ef7 (r355735)sys/arm/broadcom/bcm2835 bcm2835_bsc.c, sys/arm/mv a37x0_spi.c

Be consistent about checking return value from bus_delayed_attach_children.

Most places checked, but a couple last minute changes didn't. Make them all use
the return value.

Noticed by: rpokala@
DeltaFile
+1-3sys/arm/broadcom/bcm2835/bcm2835_bsc.c
+1-3sys/arm/mv/a37x0_spi.c
+1-3sys/dev/ow/owc_gpiobus.c
+3-93 files

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