Memory allocation fail then return NULL?

[Hojun-Cho]

I am looking at your code with great interest. It's quite interesting!
The code below does not check to see if it returns NULL. There are a few more such codes.
I'll create a PR if you need to.

qlibc/src/utilities/qstring.c

Line 391 in 6db3702

char *buf = (char *) malloc(sizeof(char) * (len + 1));

qlibc/src/utilities/qstring.c

Line 253 in 6db3702

newstr = (char *) malloc(maxstrlen + 1);

qlibc/src/utilities/qstring.c

Line 276 in 6db3702

newstr = (char *) malloc(maxstrlen + 1);

qlibc/src/utilities/qstring.c

Line 391 in 6db3702

char *buf = (char *) malloc(sizeof(char) * (len + 1));

[wolkykim]

PRs are always welcome! They need the check.