[coreboot] #99: Clean up it87xx_probe_spi_flash() for better readability

[coreboot]

#99: Clean up it87xx_probe_spi_flash() for better readability
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   Reporter:  stuge               |          Owner:  somebody             
       Type:  enhancement         |         Status:  new                  
   Priority:  minor               |      Milestone:  flashrom v1.0        
  Component:  flashrom            |        Version:                       
   Keywords:                      |   Dependencies:  spi probe readability
Patchstatus:  patch needs review  |  
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