merge tests: correct casts

tests/merge/workdir/dirty.c

@@ -162,8 +162,8 @@ static void hack_index(char *files[])
 		cl_git_pass(p_utimes(path.ptr, times));
 		cl_git_pass(p_stat(path.ptr, &statbuf));
 
-		entry->ctime.seconds = (git_time_t)statbuf.st_ctime;
-		entry->mtime.seconds = (git_time_t)statbuf.st_mtime;
+		entry->ctime.seconds = (int32_t)statbuf.st_ctime;
+		entry->mtime.seconds = (int32_t)statbuf.st_mtime;
 #if defined(GIT_USE_NSEC)
 		entry->ctime.nanoseconds = statbuf.st_ctim.tv_nsec;
 		entry->mtime.nanoseconds = statbuf.st_mtim.tv_nsec;
@@ -175,7 +175,7 @@ static void hack_index(char *files[])
 		entry->ino = statbuf.st_ino;
 		entry->uid  = statbuf.st_uid;
 		entry->gid  = statbuf.st_gid;
-		entry->file_size = statbuf.st_size;
+		entry->file_size = (uint32_t)statbuf.st_size;
 	}
 
 	git_buf_free(&path);