Fix potential memory leak on error

In osdThread.c for POSIX if pthread_create_key fails
In iocLogServer.c if fdmgr_init returns NULL
In dbBkpt.c if semaphore creation fails while adding a bp to a lockset
In devSiSoftCallback.c if linked record is not found

modules/libcom/src/log/iocLogServer.c

@@ -113,6 +113,7 @@ int main(void)
 
     pserver->pfdctx = (void *) fdmgr_init();
     if (!pserver->pfdctx) {
+        free(pserver);
         fprintf(stderr, "iocLogServer: %s\n", strerror(errno));
         return IOCLS_ERROR;
     }

modules/libcom/src/osi/os/posix/osdThread.c

@@ -956,8 +956,10 @@ LIBCOM_API epicsThreadPrivateId epicsStdCall epicsThreadPrivateCreate(void)
         return NULL;
     status = pthread_key_create(key,0);
     checkStatus(status,"pthread_key_create epicsThreadPrivateCreate");
-    if(status)
+    if(status) {
+        free(key);
         return NULL;
+    }
     return((epicsThreadPrivateId)key);
 }