[patch v2] checkpatch: warn on missing spaces in broken up quoted

[Dan Carpenter <dan.carpenter@oracle.com>]

Checkpatch already complains when people break up quoted strings but
it's still pretty common.  One mistake that people often make is they
leave out the space character between the two strings.

This check adds around 450 new warnings and has a low rate of false
positives.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
v2: Move to correct spot in checkpatch
    Fix indenting
    Use "\w" instead of "[a-zA-Z]"

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index a0880ed..132e6e2 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2361,6 +2361,12 @@ sub process {
 			     "quoted string split across lines\n" . $hereprev);
 		}
 
+# check for missing a space in a string concatination
+		if ($prevrawline =~ /[^\\]\w"$/ && $rawline =~ /^\+[\t ]+"\w/) {
+			WARN('MISSING_SPACE',
+			     "break quoted strings at a space character\n" . $hereprev);
+		}
+
 # check for spaces before a quoted newline
 		if ($rawline =~ /^.*\".*\s\\n/) {
 			if (WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",