tests: Trim .nim files trailing whitespace

via OSX: find . -name '*.nim' -exec sed -i '' -E 's/[[:space:]]+$//' {} +

tests/notnil/tnotnil.nim

@@ -7,7 +7,7 @@ type
   PObj = ref TObj not nil
   TObj = object
     x: int
-  
+
   MyString = string not nil
 
 #var x: PObj = nil

tests/notnil/tnotnil1.nim

@@ -18,7 +18,7 @@ proc q(s: superstring) =
   echo s
 
 proc p2() =
-  var  a: string = "I am not nil" 
+  var  a: string = "I am not nil"
   q(a) # but this should and does not
 
 p2()
@@ -30,7 +30,7 @@ proc p() =
   var x: pointer
   if not x.isNil:
     q(x)
-  
+
   let y = x
   if not y.isNil:
     q(y)

tests/notnil/tnotnil_in_generic.nim

@@ -9,14 +9,14 @@ type
         x: int
         ud: T
 
-proc good[T](p: A[T]) = 
+proc good[T](p: A[T]) =
     discard
 
-proc bad[T](p: A[T] not nil) = 
+proc bad[T](p: A[T] not nil) =
     discard
 
 
-proc go() = 
+proc go() =
     let s = A[int](x: 1)
 
     good(s)