fp-bit.c typo patch

[Jeffrey A Law]

  In message < 9712280535.AA32564@rios1.watson.ibm.com >you write:
  > 	This patch fixes a bootstrap failure caused by the recent fp-bit.c
  > change.
  > 
  > Sun Dec 28 00:30:24 1997  David Edelsohn  <edelsohn@mhpcc.edu>
  > 
  > 	* config/fp-bit.c (L_df_to_sf): Fix typo in last change.
Thanks.  Installed.

Odd that the libgcc-test didn't catch this...

jeff