fix leak in SPIRV code generator

BUG=skia:6101

Change-Id: Ic083becfb44e36b029ef9511825f4a681b7495f4
Reviewed-on: https://skia-review.googlesource.com/9103
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/sksl/SkSLSPIRVCodeGenerator.cpp b/src/sksl/SkSLSPIRVCodeGenerator.cpp
index 2da63da..85e996c 100644
--- a/src/sksl/SkSLSPIRVCodeGenerator.cpp
+++ b/src/sksl/SkSLSPIRVCodeGenerator.cpp
@@ -2540,6 +2540,9 @@
     this->writeInstruction(SpvOpVariable, ptrType, result, storageClass, fConstantBuffer);
     this->writeLayout(intf.fVariable.fModifiers.fLayout, result);
     fVariableMap[&intf.fVariable] = result;
+    if (fProgram.fInputs.fRTHeight) {
+        delete type;
+    }
     return result;
 }