x32: Fix coding style violations in the x32 VDSO code

Move the prototype for x32_setup_additional_pages() to a header file,
and adjust the coding style to match standard.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: H. J. Lu <hjl.tools@gmail.com>
diff --git a/arch/x86/vdso/vma.c b/arch/x86/vdso/vma.c
index 1bbcc62..d7dce1d 100644
--- a/arch/x86/vdso/vma.c
+++ b/arch/x86/vdso/vma.c
@@ -187,15 +187,15 @@
 
 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 {
-	return setup_additional_pages (bprm, uses_interp, vdso_pages,
-				       vdso_size);
+	return setup_additional_pages(bprm, uses_interp, vdso_pages,
+				      vdso_size);
 }
 
 #ifdef CONFIG_X86_X32_ABI
 int x32_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
 {
-	return setup_additional_pages (bprm, uses_interp, vdsox32_pages,
-				       vdsox32_size);
+	return setup_additional_pages(bprm, uses_interp, vdsox32_pages,
+				      vdsox32_size);
 }
 #endif