make x86 ptrace use init_fpu()

diff -urN linux-2.5.44-bk3/arch/i386/kernel/ptrace.c linux/arch/i386/kernel/ptrace.c
@@ -375,12 +375,8 @@
 			break;
 		}
 		ret = 0;
-		if ( !child->used_math ) {
-			/* Simulate an empty FPU. */
-			set_fpu_cwd(child, 0x037f);
-			set_fpu_swd(child, 0x0000);
-			set_fpu_twd(child, 0xffff);
-		}
+		if (!child->used_math)
+			init_fpu(child);
 		get_fpregs((struct user_i387_struct *)data, child);
 		break;
 	}

@@ -403,13 +399,8 @@
 			ret = -EIO;
 			break;
 		}
-		if ( !child->used_math ) {
-			/* Simulate an empty FPU. */
-			set_fpu_cwd(child, 0x037f);
-			set_fpu_swd(child, 0x0000);
-			set_fpu_twd(child, 0xffff);
-			set_fpu_mxcsr(child, 0x1f80);
-		}
+		if (!child->used_math)
+			init_fpu(child);
 		ret = get_fpxregs((struct user_fxsr_struct *)data, child);
 		break;
 	}