coverity#1427248 Operands don't affect result

and

coverity#1427249 Operands don't affect result

Change-Id: Ibda556045d7d2cffb92e01a93c0bc5bade1e78a6
Reviewed-on: https://gerrit.libreoffice.org/47533Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

include/tools/bigint.hxx

@@ -147,8 +147,8 @@ inline BigInt::operator sal_uInt16() const
 
 inline BigInt::operator sal_Int32() const
 {
-    if ( !bIsBig && nVal >= SAL_MIN_INT32 && nVal <= SAL_MAX_INT32 )
-        return (sal_Int32)nVal;
+    if (!bIsBig)
+        return nVal;
     assert(false && "out of range");
     return 0;
 }
@@ -165,8 +165,8 @@ inline BigInt::operator sal_uInt32() const
 inline BigInt::operator long() const
 {
     // Clamp to int32 since long is int32 on Windows.
-    if ( !bIsBig && nVal >= SAL_MIN_INT32 && nVal <= SAL_MAX_INT32 )
-        return (long)nVal;
+    if (!bIsBig)
+        return nVal;
     assert(false && "out of range");
     return 0;
 }