Fix gcc warning in kfpu_begin()

Observed when building on CentOS 8 Stream.  Remove the `out`
label at the end of the function and instead return.

  linux/simd_x86.h: In function 'kfpu_begin':
  linux/simd_x86.h:337:1: error: label at end of compound statement

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Attila Fülöp <attila@fueloep.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#13089

include/os/linux/kernel/linux/simd_x86.h

@@ -318,13 +318,13 @@ kfpu_begin(void)
 #if defined(HAVE_XSAVES)
 	if (static_cpu_has(X86_FEATURE_XSAVES)) {
 		kfpu_do_xsave("xsaves", &state->xsave, ~0);
-		goto out;
+		return;
 	}
 #endif
 #if defined(HAVE_XSAVEOPT)
 	if (static_cpu_has(X86_FEATURE_XSAVEOPT)) {
 		kfpu_do_xsave("xsaveopt", &state->xsave, ~0);
-		goto out;
+		return;
 	}
 #endif
 	if (static_cpu_has(X86_FEATURE_XSAVE)) {
@@ -334,7 +334,6 @@ kfpu_begin(void)
 	} else {
 		kfpu_save_fsave(&state->fsave);
 	}
-out:
 }
 #endif /* defined(HAVE_KERNEL_FPU_XSAVE_INTERNAL) */