Fix compiler warning

Move both initialization outside of the conditional.

Fixes:
simyaesu.c:364:12: warning: ‘pbuf’ may be used uninitialized [-Wmaybe-uninitialized]

simulators/simyaesu.c

@@ -42,8 +42,6 @@ int main(int argc, char *argv[])
         if (getmyline(fd, buf))
         {
             printf("Cmd:%s\n", buf);
-            resp[0] = 0;
-            pbuf = NULL;
         }
 
         //else { return 0; }
@@ -55,6 +53,9 @@ int main(int argc, char *argv[])
 
         if (power == 0 && strcmp(buf, "PS1;") != 0) { continue; }
 
+        resp[0] = 0;
+        pbuf = NULL;
+
         if (strcmp(buf, "PS;") == 0)
         {
             sprintf(resp, "PS%d;", power);