libs/libc/unistd/lib_getcwd.c: remove stray sched_unlock(). Also fixes several typos.

include/dsp.h

@@ -364,7 +364,7 @@ struct foc_data_s
   dq_frame_t       i_dq;     /* Current in dq frame */
   dq_frame_t       i_dq_err; /* DQ current error */
 
-  dq_frame_t       i_dq_ref; /* Currrent dq reference frame */
+  dq_frame_t       i_dq_ref; /* Current dq reference frame */
   pid_controller_t id_pid;   /* Current d-axis component PI controller */
   pid_controller_t iq_pid;   /* Current q-axis component PI controller */
 

include/nuttx/init.h

@@ -75,7 +75,7 @@ enum nx_initstate_e
   OSINIT_MEMORY    = 3,  /* The memory manager has been initialized */
   OSINIT_HARDWARE  = 4,  /* MCU-specific hardware is initialized.  Hardware
                           * resources such as timers and device drivers are
-                          * now avaiable.  Low-level OS services sufficient
+                          * now available.  Low-level OS services sufficient
                           * to support the hardware are also available but
                           * the OS has not yet completed its full
                           * initialization. */

include/nuttx/sched.h

@@ -775,7 +775,7 @@ struct pthread_tcb_s
   /* Clean-up stack *************************************************************/
 
 #ifdef CONFIG_PTHREAD_CLEANUP
-  /* tos   - The index to the next avaiable entry at the top of the stack.
+  /* tos   - The index to the next available entry at the top of the stack.
    * stack - The pre-allocated clean-up stack memory.
    */
 

include/nuttx/syslog/syslog.h

@@ -58,7 +58,7 @@
  *
  * In addition, some SYSLOG device must also be enabled that will provide
  * the syslog output "channel.  As of this writing, there are two SYSLOG
- * devices avaiable:
+ * devices available:
  *
  *   1. A RAM SYSLOGing device that will log data into a circular buffer
  *      that can be dumped using the NSH dmesg command.  This device is