convert OSL_FAIL to SAL_WARN

Change-Id: I001f29dca5f2a01d70115bb309c99c64c4a65efb

formula/source/core/api/FormulaCompiler.cxx

@@ -1885,7 +1885,7 @@ FormulaToken* FormulaCompiler::CreateStringFromToken( OUStringBuffer& rBuffer, F
             case svSep:
                 break;      // Opcodes
             default:
-                OSL_FAIL("FormulaCompiler:: GetStringFromToken errUnknownVariable");
+                SAL_WARN("formula.core", "FormulaCompiler::GetStringFromToken: unknown token type " << t->GetType());
             } // of switch
         }
     }

formula/source/core/api/token.cxx

@@ -922,7 +922,7 @@ bool FormulaTokenArray::HasMatrixDoubleRefOps()
                 sp = sal::static_int_cast<short>( sp - nParams );
                 if ( sp < 0 )
                 {
-                    OSL_FAIL( "FormulaTokenArray::HasMatrixDoubleRefOps: sp < 0" );
+                    SAL_WARN("formula.core", "FormulaTokenArray::HasMatrixDoubleRefOps: sp < 0" );
                     sp = 0;
                 }
                 pStack[sp++] = pResult;