nfs4: Fix error checking after read_port()

src/add-ons/kernel/file_systems/nfs4/IdMap.cpp

@@ -118,8 +118,8 @@ IdMap::_GetBuffer(T value, int32 code)
 		if (buffer == NULL)
 			return NULL;
 
-		result = read_port(fReplyPort, &code, buffer, size);
-		if (result < B_OK) {
+		size = read_port(fReplyPort, &code, buffer, size);
+		if (size < B_OK) {
 			free(buffer);
 
 			if (_Repair() != B_OK)

src/add-ons/kernel/file_systems/nfs4/idmapper/IdMapper.cpp

@@ -198,13 +198,13 @@ MainLoop()
 			return B_NO_MEMORY;
 
 		int32 code;
-		status_t result = read_port(gRequestPort, &code, buffer, size);
+		size = read_port(gRequestPort, &code, buffer, size);
 		if (size < B_OK) {
 			free(buffer);
 			return 0;
 		}
 
-		result = ParseRequest(code, buffer);
+		status_t result = ParseRequest(code, buffer);
 		free(buffer);
 
 		if (result != B_OK)