Remove an extra function call in primask::read

There doesn't seem to be any reason why the call to `__primask_r` should
be wrapped by another function call.

Author: yvt

src/register/primask.rs

@@ -26,11 +26,7 @@ impl Primask {
 /// Reads the CPU register
 #[inline]
 pub fn read() -> Primask {
-    fn read_raw() -> u32 {
-        call_asm!(__primask_r() -> u32)
-    }
-
-    let r = read_raw();
+    let r: u32 = call_asm!(__primask_r() -> u32);
     if r & (1 << 0) == (1 << 0) {
         Primask::Inactive
     } else {