psp: Force channels to stereo if user requested anything other than mono.

Before it would only clamp to stereo if it also had to resample, which would
fail if the app specified 44100Hz and surround sound.

src/audio/psp/SDL_pspaudio.c

@@ -64,6 +64,7 @@ PSPAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
         format = PSP_AUDIO_FORMAT_MONO;
     } else {
         format = PSP_AUDIO_FORMAT_STEREO;
+        this->spec.channels = 2;  /* we're forcing the hardware to stereo. */
     }
 
     /*  PSP has some limitations with the Audio. It fully supports 44.1KHz (Mono & Stereo),
@@ -73,7 +74,6 @@ PSPAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
         this->hidden->channel = sceAudioChReserve(PSP_AUDIO_NEXT_CHANNEL, this->spec.samples, format);
     } else {
         this->hidden->channel = sceAudioSRCChReserve(this->spec.samples, this->spec.freq, 2);
-        this->spec.channels = 2;  /* we're forcing the hardware to stereo. */
     }
     
     if (this->hidden->channel < 0) {