kernel-doc: strip leading blank lines from inline doc comments

The inline member markup allows whitespace lines before the actual
documentation starts. Strip the leading blank lines. This improves the
rst output.
Signed-off-by: NJani Nikula <jani.nikula@intel.com>

scripts/kernel-doc

@@ -2889,6 +2889,10 @@ sub process_file($) {
 	    } elsif (/$doc_content/) {
 		if ($inline_doc_state == STATE_INLINE_TEXT) {
 		    $contents .= $1 . "\n";
+		    # nuke leading blank lines
+		    if ($contents =~ /^\s*$/) {
+			$contents = "";
+		    }
 		} elsif ($inline_doc_state == STATE_INLINE_NAME) {
 		    $inline_doc_state = STATE_INLINE_ERROR;
 		    print STDERR "Warning(${file}:$.): ";