selftests: fix some typos in tools/testing/selftests

Fix multiple spelling errors:

 - "rougly" -> "roughly"
 - "fielesystems" -> "filesystems"
 - "Can'" -> "Can't"

Link: https://lkml.kernel.org/r/20250503211959.507815-1-chelsyratnawat2001@gmail.com
Signed-off-by: Chelsy Ratnawat <chelsyratnawat2001@gmail.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: ChelsyRatnawat

tools/testing/selftests/filesystems/file_stressor.c

@@ -156,7 +156,7 @@ TEST_F_TIMEOUT(file_stressor, slab_typesafe_by_rcu, 900 * 2)
 			ssize_t nr_read;
 
 			/*
-			 * Concurrently read /proc/<pid>/fd/ which rougly does:
+			 * Concurrently read /proc/<pid>/fd/ which roughly does:
 			 *
 			 * f = fget_task_next(p, &fd);
 			 * if (!f)

tools/testing/selftests/mm/gup_longterm.c

@@ -158,7 +158,7 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
 		/*
 		 * R/O pinning or pinning in a private mapping is always
 		 * expected to work. Otherwise, we expect long-term R/W pinning
-		 * to only succeed for special fielesystems.
+		 * to only succeed for special filesystems.
 		 */
 		should_work = !shared || !rw ||
 			      fs_supports_writable_longterm_pinning(fs_type);

tools/testing/selftests/thermal/intel/power_floor/power_floor_test.c

@@ -56,7 +56,7 @@ int main(int argc, char **argv)
 	}
 
 	if (write(fd, "1\n", 2) < 0) {
-		perror("Can' enable power floor notifications\n");
+		perror("Can't enable power floor notifications\n");
 		exit(1);
 	}
 

tools/testing/selftests/thermal/intel/workload_hint/workload_hint_test.c

@@ -37,7 +37,7 @@ void workload_hint_exit(int signum)
 	}
 
 	if (write(fd, "0\n", 2) < 0) {
-		perror("Can' disable workload hints\n");
+		perror("Can't disable workload hints\n");
 		exit(1);
 	}
 
@@ -99,7 +99,7 @@ int main(int argc, char **argv)
 	}
 
 	if (write(fd, "1\n", 2) < 0) {
-		perror("Can' enable workload hints\n");
+		perror("Can't enable workload hints\n");
 		exit(1);
 	}