[Analyzer] Removed extra space from NSErrorChecker debug message and updated relevant tests

[NoQ]

Thanks! I'll commit.

[usama54321]

Updated tests

[usama54321]

Fixed clang-format issue

clang/lib/StaticAnalyzer/Checkers/NSErrorChecker.cpp

void NSOrCFErrorDerefChecker::checkEvent(ImplicitNullDerefEvent event) const {
 
   if (!(isNSError || isCFError))
     return;
 
   // Storing to possible null NSError/CFErrorRef out parameter.
   SmallString<128> Buf;
   llvm::raw_svector_ostream os(Buf);
 
-  os << "Potential null dereference.  According to coding standards ";
+  os << "Potential null dereference. According to coding standards ";
   os << (isNSError
          ? "in 'Creating and Returning NSError Objects' the parameter"
          : "documented in CoreFoundation/CFError.h the parameter");
 
   os  << " may be null";
 
   BugType *bug = nullptr;
   if (isNSError) {

clang/test/Analysis/CheckNSError.m

 - (void)myMethodWhichMayFail:(NSError **)error;
 - (BOOL)myMethodWhichMayFail2:(NSError **)error;
 - (BOOL)myMethodWhichMayFail3:(NSError **_Nonnull)error;
 - (BOOL)myMethodWhichMayFail4:(NSError **)error __attribute__((nonnull));
 @end
 
 @implementation A
 - (void)myMethodWhichMayFail:(NSError **)error {   // expected-warning {{Method accepting NSError** should have a non-void return value to indicate whether or not an error occurred}}
-  *error = [NSError errorWithDomain:@"domain" code:1 userInfo:0]; // expected-warning {{Potential null dereference}}
+  *error = [NSError errorWithDomain:@"domain" code:1 userInfo:0]; // expected-warning {{Potential null dereference. According to coding standards in 'Creating and Returning NSError Objects' the parameter may be null [osx.cocoa.NSError]}}
 }
 
 - (BOOL)myMethodWhichMayFail2:(NSError **)error {  // no-warning
   if (error) *error = [NSError errorWithDomain:@"domain" code:1 userInfo:0]; // no-warning
   return 0;
 }
 
 - (BOOL)myMethodWhichMayFail3:(NSError **_Nonnull)error {         // no-warning
   *error = [NSError errorWithDomain:@"domain" code:1 userInfo:0]; // no-warning
   return 0;
 }
 
 - (BOOL)myMethodWhichMayFail4:(NSError **)error {                 // no-warning
   *error = [NSError errorWithDomain:@"domain" code:1 userInfo:0]; // no-warning
   return 0;
 }
 @end
 
 struct __CFError {};
 typedef struct __CFError* CFErrorRef;
 
 void foo(CFErrorRef* error) { // expected-warning {{Function accepting CFErrorRef* should have a non-void return value to indicate whether or not an error occurred}}
-  *error = 0;  // expected-warning {{Potential null dereference}}
+  *error = 0;  // expected-warning {{Potential null dereference. According to coding standards documented in CoreFoundation/CFError.h the parameter may be null [osx.coreFoundation.CFError]}}
 }
 
 int f1(CFErrorRef* error) {
   if (error) *error = 0; // no-warning
   return 0;
 }
 
 int f2(CFErrorRef* error) {
   if (0 != error) *error = 0; // no-warning
   return 0;
 }
 
 int f3(CFErrorRef* error) {
   if (error != 0) *error = 0; // no-warning
   return 0;
 }
 
 int __attribute__((nonnull)) f4(CFErrorRef *error) {
   *error = 0; // no-warning
   return 0;
 }
 
 int __attribute__((nonnull(1))) f5(int *x, CFErrorRef *error) {
-  *error = 0; // expected-warning {{Potential null dereference}}
+  *error = 0; // expected-warning {{Potential null dereference. According to coding standards documented in CoreFoundation/CFError.h the parameter may be null [osx.coreFoundation.CFError]}}
   return 0;
 }
 
 int __attribute__((nonnull(2))) f6(int *x, CFErrorRef *error) {
   *error = 0; // no-warning
   return 0;
 }