fix ungrammatical comment in posix_spawn code

src/process/posix_spawn.c

@@ -77,9 +77,9 @@ static int child(void *args_vp)
 		if ((ret=__syscall(SYS_setpgid, 0, attr->__pgrp)))
 			goto fail;
 
-	/* Use syscalls directly because pthread state because the
-	 * library functions attempt to do a multi-threaded synchronized
-	 * id-change, which would trash the parent's state. */
+	/* Use syscalls directly because the library functions attempt
+	 * to do a multi-threaded synchronized id-change, which would
+	 * trash the parent's state. */
 	if (attr->__flags & POSIX_SPAWN_RESETIDS)
 		if ((ret=__syscall(SYS_setgid, __syscall(SYS_getgid))) ||
 		    (ret=__syscall(SYS_setuid, __syscall(SYS_getuid))) )