tdf#122172 set textContent to nil in OOoContentDataProvider

This should prevent the crash - at least it did for me AFAICS.

Change-Id: I489264d8054e6577b948b0ab307c863d3140788a
Reviewed-on: https://gerrit.libreoffice.org/70755
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
diff --git a/extensions/source/macosx/spotlight/OOoContentDataParser.m b/extensions/source/macosx/spotlight/OOoContentDataParser.m
index d394115..89d92a8 100644
--- a/extensions/source/macosx/spotlight/OOoContentDataParser.m
+++ b/extensions/source/macosx/spotlight/OOoContentDataParser.m
@@ -98,6 +98,7 @@

        [textContent appendString:[NSString stringWithString:runningTextContent]];
        [runningTextContent release];
        runningTextContent = nil;
    }
    shouldReadCharacters = NO;
}
@@ -125,9 +126,11 @@

    if (runningTextContent != nil) {
        [runningTextContent release];
        runningTextContent = nil;
    }
    if (textContent != nil) {
        [textContent release];
        textContent = nil;
    }
}

@@ -137,6 +140,7 @@
    if (textContent != nil && [textContent length] > 0) {
        [mdiValues setObject:[NSString stringWithString:textContent] forKey:(NSString*)kMDItemTextContent];
        [textContent release];
        textContent = nil;
    }
}