Abi: Fix warning about conversion from int to unsigned char

Change-Id: I49ce840823d4a60a1d97a7313551b00e39929619
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>

src/plugins/projectexplorer/abi.cpp

@@ -471,7 +471,7 @@ Abi Abi::abiFromTargetTriplet(const QString &triple)
     Abi::OS os = Abi::UnknownOS;
     Abi::OSFlavor flavor = Abi::UnknownFlavor;
     Abi::BinaryFormat format = Abi::UnknownFormat;
-    int width = 0;
+    unsigned char width = 0;
     int unknownCount = 0;
 
     foreach (const QString &p, parts) {