fix: change to single line if for countls and change x to f (typo)

Author: krishna2803

libc/src/__support/fixed_point/fx_bits.h

@@ -187,12 +187,11 @@ countls(T f) {
   constexpr int CONTAIN_LEN = cpp::numeric_limits<BitType>::digits;
   constexpr int PADDING_LEN = CONTAIN_LEN - FXRep::TOTAL_LEN;
 
-  if constexpr (FXRep::SIGN_LEN != 0) {
+  if constexpr (FXRep::SIGN_LEN != 0)
     if (f < 0)
       f = bit_not(f);
-  }
 
-  BitType value_bits = FXBits(x)::get_bits();
+  BitType value_bits = FXBits(f)::get_bits();
   return cpp::countl_zero(value_bits) - PADDING_LEN;
 }