Removed redundant declaration check; changed relevant test cases

test/libsolidity/syntaxTests/array/uninitialized_storage_var.sol

@@ -2,8 +2,10 @@ contract C {
 	function f() public {
 		uint[] storage x;
 		uint[10] storage y;
+		x;
+		y;
 	}
 }
 // ----
-// DeclarationError: (38-54): Uninitialized storage pointer.
-// DeclarationError: (58-76): Uninitialized storage pointer.
+// TypeError: (80-81): This variable is of storage pointer type and can be accessed without prior assignment, which would lead to undefined behaviour.
+// TypeError: (85-86): This variable is of storage pointer type and can be accessed without prior assignment, which would lead to undefined behaviour.

test/libsolidity/syntaxTests/nameAndTypeResolution/211_uninitialized_mapping_array_variable.sol

@@ -5,4 +5,4 @@ contract C {
     }
 }
 // ----
-// DeclarationError: (52-85): Uninitialized storage pointer.
+// TypeError: (95-96): This variable is of storage pointer type and can be accessed without prior assignment, which would lead to undefined behaviour.

test/libsolidity/syntaxTests/nameAndTypeResolution/233_non_initialized_references.sol

@@ -8,4 +8,4 @@ contract C {
     }
 }
 // ----
-// DeclarationError: (84-95): Uninitialized storage pointer.
+// TypeError: (105-106): This variable is of storage pointer type and can be accessed without prior assignment, which would lead to undefined behaviour.

test/libsolidity/syntaxTests/parsing/arrays_in_expressions.sol

@@ -3,4 +3,3 @@ contract c {
 }
 // ----
 // TypeError: (39-58): Type int_const 7 is not implicitly convertible to expected type contract c[10] storage pointer.
-// DeclarationError: (60-83): Uninitialized storage pointer.