m68k: Fix `struct sigcontext' for ColdFire

LibSegFault uses piggybacks sc_fpstate field of the `struct sigcontext'
and this patch avoids LibSegFault overflowing this field. Also this
removes an unnecessary divergence from classic m68k.

Signed-off-by: Maxim Kuvyrkov <[e-mail]>
Signed-off-by: Geert Uytterhoeven <[e-mail]>

arch/m68k/include/asm/sigcontext.h

···
 #ifndef __uClinux__
 # ifdef __mcoldfire__
 	unsigned long  sc_fpregs[2][2];	/* room for two fp registers */
-	unsigned long  sc_fpcntl[3];
-	unsigned char  sc_fpstate[16+6*8];
 # else
 	unsigned long  sc_fpregs[2*3];  /* room for two fp registers */
+# endif
 	unsigned long  sc_fpcntl[3];
 	unsigned char  sc_fpstate[216];
-# endif
 #endif
 };