Adjust to recent ObjFW changes

FossilOrigin-Name: fc8e42990e7f6476b8b806521222620bbac0496c61a91b20f9e3787fc20fdbb4

src/exceptions/PGCommandFailedException.h

@@ -1,14 +1,18 @@
 #import "PGException.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 @interface PGCommandFailedException: PGException
 {
 	OFString *_command;
 }
 
-@property (readonly, copy) OFString *command;
+@property (readonly, nonatomic) OFString *command;
 
-+ (instancetype)exceptionWithConnection: (PGConnection*)connection
-				command: (OFString*)command;
-- initWithConnection: (PGConnection*)connection
-	     command: (OFString*)command;
++ (instancetype)exceptionWithConnection: (PGConnection *)connection
+				command: (OFString *)command;
+- initWithConnection: (PGConnection *)connection
+	     command: (OFString *)command;
 @end
+
+OF_ASSUME_NONNULL_END

src/exceptions/PGCommandFailedException.m

@@ -3,15 +3,15 @@
 @implementation PGCommandFailedException
 @synthesize command = _command;
 
-+ (instancetype)exceptionWithConnection: (PGConnection*)connection
-				command: (OFString*)command
++ (instancetype)exceptionWithConnection: (PGConnection *)connection
+				command: (OFString *)command
 {
 	return [[[self alloc] initWithConnection: connection
 					 command: command] autorelease];
 }
 
-- initWithConnection: (PGConnection*)connection
-	     command: (OFString*)command
+- initWithConnection: (PGConnection *)connection
+	     command: (OFString *)command
 {
 	self = [super initWithConnection: connection];
 
@@ -32,7 +32,7 @@
 	[super dealloc];
 }
 
-- (OFString*)description
+- (OFString *)description
 {
 	return [OFString stringWithFormat: @"A PostgreSQL command failed: %@\n"
 					   @"Command: %@", _error, _command];

src/exceptions/PGConnectionFailedException.h

@@ -1,4 +1,8 @@
 #import "PGException.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 @interface PGConnectionFailedException: PGException
 @end
+
+OF_ASSUME_NONNULL_END

src/exceptions/PGConnectionFailedException.m

@@ -1,7 +1,7 @@
 #import "PGConnectionFailedException.h"
 
 @implementation PGConnectionFailedException
-- (OFString*)description
+- (OFString *)description
 {
 	return [OFString stringWithFormat:
 	    @"Establishing a PostgreSQL connection failed:\n%@\n"

src/exceptions/PGException.h

@@ -2,14 +2,18 @@
 
 #import "PGConnection.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 @interface PGException: OFException
 {
 	PGConnection *_connection;
 	OFString *_error;
 }
 
-@property (readonly, retain) PGConnection *connection;
+@property (readonly, nonatomic) PGConnection *connection;
 
-+ (instancetype)exceptionWithConnection: (PGConnection*)connection;
-- initWithConnection: (PGConnection*)connection;
++ (instancetype)exceptionWithConnection: (PGConnection *)connection;
+- initWithConnection: (PGConnection *)connection;
 @end
+
+OF_ASSUME_NONNULL_END

src/exceptions/PGException.m

@@ -3,12 +3,12 @@
 @implementation PGException
 @synthesize connection = _connection;
 
-+ (instancetype)exceptionWithConnection: (PGConnection*)connection
++ (instancetype)exceptionWithConnection: (PGConnection *)connection
 {
 	return [[[self alloc] initWithConnection: connection] autorelease];
 }
 
-- initWithConnection: (PGConnection*)connection
+- initWithConnection: (PGConnection *)connection
 {
 	self = [super init];
 
@@ -33,7 +33,7 @@
 	[super dealloc];
 }
 
-- (OFString*)description
+- (OFString *)description
 {
 	return [OFString stringWithFormat: @"A PostgreSQL operation failed: %@",
 					   _error];