tdf#120703 PVS: dereference before nullptr check

V595 The 'ustrFile' pointer was utilized before it was verified against nullptr.
     Check lines: 83, 107.

Change-Id: I874983508fb805b1f0a55b3a5b6d4d78ae1babdb
Reviewed-on: https://gerrit.libreoffice.org/71472
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

sal/osl/all/filepath.cxx

@@ -19,6 +19,7 @@
 
 #include <osl/file.h>
 #include <rtl/ustring.h>
+#include <cassert>
 
 static sal_uInt32 osl_defCalcTextWidth( rtl_uString *ustrText )
 {
@@ -49,6 +50,8 @@ oslFileError SAL_CALL osl_abbreviateSystemPath( rtl_uString *ustrSystemPath, rtl
         }
     }
 
+    assert(ustrPath && ustrFile);
+
     uPathWidth = pfnCalcWidth( ustrPath );
     uFileWidth = pfnCalcWidth( ustrFile );
 
@@ -101,11 +104,8 @@ oslFileError SAL_CALL osl_abbreviateSystemPath( rtl_uString *ustrSystemPath, rtl
         uPathWidth = pfnCalcWidth( *pustrCompacted );
     }
 
-    if ( ustrPath )
-        rtl_uString_release( ustrPath );
-
-    if ( ustrFile )
-        rtl_uString_release( ustrFile );
+    rtl_uString_release(ustrPath);
+    rtl_uString_release(ustrFile);
 
     return osl_File_E_None;
 }