m68k: math-emu: Add missing prototypes
When building with W=1:
arch/m68k/math-emu/fp_arith.c:301:16: warning: no previous prototype for ‘fp_fsglmul’ [-Wmissing-prototypes]
301 | struct fp_ext *fp_fsglmul(struct fp_ext *dest, struct fp_ext *src)
| ^~~~~~~~~~
arch/m68k/math-emu/fp_arith.c:357:16: warning: no previous prototype for ‘fp_fsgldiv’ [-Wmissing-prototypes]
357 | struct fp_ext *fp_fsgldiv(struct fp_ext *dest, struct fp_ext *src)
| ^~~~~~~~~~
CC arch/m68k/math-emu/fp_log.o
...
Fix this by adding the missing prototypes to header files.
Reported-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20230810141947.1236730-17-arnd@kernel.org/
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/96c039640d76973ea762d79018de0bc75bbdc1dc.1692283195.git.geert@linux-m68k.org
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