Analyse issues on TBXML.m and TBXML+Compression.m

[bipingm]

Running Analyse with XCode5-DP6 results in a few coding conventions issues like this in TBXML.m:

Pods/TBXML/TBXML-Code/TBXML.m:253:16: Potential null dereference. According to coding standards in 'Creating and Returning NSError Objects' the parameter may be null

and a warning:
Pods/TBXML/TBXML-Code/TBXML.m:360:25: Using 'stringWithString:' with a literal is redundant

Issues in TBXML+Compression.m
Pods/TBXML/TBXML-Code/TBXML+Compression.m:127:67: The left operand of '&' is a garbage value

[harshitgupta]

+1