Don't apply config options to uninitialized synths

Fixes crash when mt32emu options are non-default and ROMs are not
present.

CHANGELOG.md

@@ -15,6 +15,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - MIDI and UART related warnings are now hidden unless verbose mode is enabled in the configuration file. This is a preventative measure against false bug reports stemming from buggy games/user equipment, and to improve aesthetics (real synthesizers tend to silently ignore harmless stray MIDI bytes).
 
+### Fixed
+
+- Guru Meditation that could occur if non-default mt32emu options were specified but the synth was unavailable due to missing ROMs.
+
 ## [0.10.1] - 2021-08-01
 
 ### Changed

src/mt32pi.cpp

@@ -367,6 +367,7 @@ bool CMT32Pi::InitMT32Synth()
 		m_pLogger->Write(MT32PiName, LogWarning, "mt32emu init failed; no ROMs present?");
 		delete m_pMT32Synth;
 		m_pMT32Synth = nullptr;
+		return false;
 	}
 
 	// Set initial MT-32 channel assignment from config
@@ -378,7 +379,7 @@ bool CMT32Pi::InitMT32Synth()
 
 	m_pMT32Synth->SetUserInterface(&m_UserInterface);
 
-	return m_pMT32Synth != nullptr;
+	return true;
 }
 
 bool CMT32Pi::InitSoundFontSynth()
@@ -391,11 +392,12 @@ bool CMT32Pi::InitSoundFontSynth()
 		m_pLogger->Write(MT32PiName, LogWarning, "FluidSynth init failed; no SoundFonts present?");
 		delete m_pSoundFontSynth;
 		m_pSoundFontSynth = nullptr;
+		return false;
 	}
 
 	m_pSoundFontSynth->SetUserInterface(&m_UserInterface);
 
-	return m_pSoundFontSynth != nullptr;
+	return true;
 }
 
 void CMT32Pi::MainTask()